Supply and demand, dude. Not everyone can be in position. That doesn't mean there aren't many qualified to do that job. Your argument is just lame. In fact, I've seen plenty of sh** GMs that I could do better than. You should just step into the world and understand that things don't operate fairly or perfectly.

Dunning-Kruger effect
This isn't a case of me saying I have such great skills per se, btw. I'm not claiming I could be a great architect or doctor or lawyer (without years of training). I'm telling you that being a basketball GM is not the high end work you think it is. Yes, it's an awesome position to have; but plenty of morons have attained it (some have even done okay).