thanks for administrator's input, so I just state the fact rather than pointing out the seller in trademe. This post will talk about black berry mobile only. I know it is GPS forum. but it is kind of related to my previous posts. Hopefully administrator will be happy to let me post here. if you do not know what is blackberry, please take a look this article in wiki:http://en.wikipedia.org/wiki/BlackBerry
 
Before I can expose more here, I have to explain how one blackberry is made i.e. the production process.


Blackberry Canada is just a design company, which means it owns all the patents and design techniques. So when the design team in Canada make phototype of one new model after long test. Blackberry will decide to produce this model massively. however, blackberry does not own any factories. The reasons can be two:1. to maintain of such a large factory chain is a huge cost. Imaging 100k workers in one factory, how many such factories in NZ or Australia.

But it is so normal in China/ South east Asia/ Mexico because the human power cost there is cheap. 2. no need to take any troublesome responsibility to the factory. It is true. If you have enough time to go through many reports on evaluating the working condition of those factories which are producing orders for Disney or iphone. Those factories are called blood and tear factories. So if any bad things are exposed from those factories, blackberry can easily walk away by ending the contract and find another blood and tear factories.

But if those factories are physically and legally belong to blackberry there are only two ways to bankrupt of blackberry: 1 price of all the blackberry will be insane so no one buy it or 2 100k workers file lawsuits together for unfair and illegal treatment. either way will cause bankrupt of blackberry. So is apple company(iphone). Be patient, I know you want to know this post's main subject, but you have to allow me to murmur sth. I believe that no one want to choose to work like a dog. But there is not fairness in our international society. So when a human/a family/an area/one nation/a country is so poor and there is a chance for them to make a living. Good or bad is not so important any more. Please do not tell me sth like this" i am poor too, but I still work hard to make a living".

What I am talking about here is that from birth, if you have to fight for living, you will not spend too much time in thinking of fairness and rightness. So when you ask that why those people in other countries keep doing those things...I probably can answer here though it might not be 100% right: The reason for the existence of these behaviors can be their own problems and problems of developed countries.

People might know too well about their own problems, less education, corrupt government and too many peoples. But you should also see the involving of those international companies, like blackberry and apple. Because those international companies pursue the most profit, which means lower cost and higher price. So all the reasons come together and make the existence of blood and tear factories.
 
So let us come back to main point of this post but do not forget my introduction above because it will help you to understand what happens below. So blackberry needs to find some factories to produce those models. According to blackberry report, there are four manufacture bases in the world which will take the order from blackberry. Four bases are China. Mexico, Canada, Hungary. However most of assembling works are done in China/Mexico because of cheap human power. 

So in those factories of all these bases, there are many abandon mother boards of blackberry during manufacture process. For example, some mother board have some faulty capacities. Usually factories will abandon them rather than repair them because it is cheap and fast to make another new one. So many electronic waste are generated from those factories and they have to be processed properly. Yes blackberry will find a proper company with a valid electronic waste processing license. However no country wants electronic waste because it is a huge cost to process them properly. However, some trading companies in HK will purchase those wastes from recycling companies. But of course, those recycling companies need to process those wastes first before selling to trading companies in HK.

So a hole will be screwed in the mother board. However in most cases, wastes are just sold to trading companies in HK. They are wastes and if someone want to buy them with a good price. It really saves a lot of trouble to both sides. So as you can see in figure 1 and figure 2(http://qimg.yesky.com/uploads/attachments/2009-10/15/6069pd2p.jpg and http://qimg.yesky.com/uploads/attachments/2009-10/15/u13xuowg.jpg), those are the wastes, i.e. mother boards.

So in those small workshops, these workshops will be processed. first good mother boards will be selected out, then they will try to repair those bad mother boards. some might be can be repaired, but others can not. So useful elements, such as resistances, capacities and other electronic components will be taken out of mother boards.
Using those elements in one empty mother, they can assemble another good mother boards. So what happen to those mother boards with hole. as you can see from figure 3 and figure 4(http://www.024sj.com/news/UploadFiles_6975/200908/20090831115754347.jpg and http://www.024sj.com/news/UploadFiles_6975/200908/20090831115754363.jpg), a shortcut will be used to jump from one side to another side. Surprise yes, it works. so you might ask it is only a mother board, how about the shell and other accessories.

Come on, It is so easy to make them or get from other wastes. for example, there are many blackberry phones which can not be repaired. It is easy to make a fake plastic shell of blackberry and low quality of accessories. So you can calculate, the mother board are purchased as wastes, which are really cheap. Other accessories, low quality, are also cheap. So such a "clone" blackberry might only cost 60NZD or 70NZD. But when those phones are sold as new items, 50% off of real brand new items, wow! I do not need to continue to calculate but you should know what is going on here.

So since this can happen to blackberry, it can happen to any mobile phone and any electronic products. I am not saying all the sellers in trademe are selling those products. But keep this in mind, if such a brand new item is sold at 700NZD at dicksmith, and some sellers can sell at 400NZD or less massively as brand new items, should you question before you buy