I would never defend someone for not doing enough testing, but I find it hard to hate these guys for this issue. It constantly amazes me just how much the Pi provides in such a small package, at such a low price. Speaking strictly a hobbyist, personally I wouldn't have a problem paying for an official power supply on top of the Pi unit itself - still seems like good value for money.
That's just my personal opinion based on my personal circumstances though. Like other have noted, if I was someone buying in bulk / using these in a large scale non-hobbyist context then my opinion may well be different.
Biting the hand that feeds IT
