Why aren't more investors acting as GC's??

[Clayton Swansen]

Hi everyone! I went to my local REI meeting tonight here in Bellingham, Washington, and was so incredibly moved and motivated by all of the people who are working so intently to make their dreams come true for themselves. One scrappy young guy in particular, named Robert was a real life example of someone who started from nothing, and is making his dreams a reality. It's amazing and beyond inspiring...

Anyhow, I've got a truly burning question that I want to throw out to the BP community. So here goes:

Why don't more investors act as their own GC's?

I can't think of any reason one wouldn't be his or her own GC unless they don't have the time, or just hate coordinating, and managing projects... in which case it seems like REI might not be the right fit! It seems to me it would save money, and a lot of headaches given the zillion posts about the lack of good GC's out there.

Can I get some opinions/reasons on why this is a trend, or am I totally off base here? It seems like GC's are rarely investors, and investors are rarely GC's! What gives? 

I leave it to you, my friends. Thank you!