dratsab: The reason Trademe don't get involved has already been explained.
I read your previous posts but none contained an explanation of why TradeMe would not get involved in the one case of concert tickets. In other posts you do point out they act to protect the integrity of the market for other items.
Last time I purchased concert tickets from TradeMe they were sold by a person who had received complimentary tickets but could not attend due to a pre-booked holiday on the same date. Concert was sold out, the asking price was the same as or very close to the booking office price iirc. I was a happy customer.
Hypothetically if the concert had been cancelled I expect that person would have refunded the purchase price. I would have expected some involvement from TradeMe if the person did not.
Can you explain to me then why TradeMe are happy to collect the commissions from these sales but are unwilling to take minimal steps to protect the integrity of the market in this instance?