I don't know why people get so bothered about something that sold for some price that seems excessive. This is usually posted over on the eBay Watch thread and I've no idea why people continue to post about things they would not buy on eBay usually ridiculing the person that did/might buy it in the process.
I rarely see as many bargains highlighted, we won't go into why. Anyway, who knows why that purchaser agreed to the price;
he/she needs one and it's worth having to him/her,
won the lottery and price is no object,
couldn't find the prototype on sale after his share price made new high,
price wasn't excessive at all as pointed out already
is speculating on the future price,
Purchased for a commercial project, someone else paying the bill