I spent some time helping someone out with theirs.  I know computer people prefer self building, more bang for the buck, more fun in researching and assembling, more performance, and if they like installing additional fans and blinking lights, glass panels etc but does a big brand computer suit or even preferable to Joe Bloggs?  

These days laptop are prob the way than big desktop PC but for the conversation let's focus on desktops because they can be self assembled unlike laptop computers.  

They wouldn't know where to start so either they get helped in building one or they purchase a barebones system or a system with a Windows license, a screen and all.  When they encounter problems they would take it back to the store, needs to be purchased locally than the hassle of sending it to another part of NZ.  OTOH they can purchase a computer from Harvey Norman or Dell Online or a Mac.  They don't have so many parts to select, the parts are maybe known to work with each other?  If they are unable to resolve it on the telephone they get sent a courier box to have it shipped to their repair centre?  There is also the option of onsite support too right?  

With corporate IT big brands are maybe preferable right, saves the time in research, assembling, they are all the same and imaging them will be the same for all.  The manufacturer will keep spare parts and able to repair x years after purchase.  

Like to hear your thoughts.  :)