I think it depends on your skillset, too. Some of us have a hard time sharing control. Personally, this is one of the reasons I've always wanted to run my own company. I mean, It's possible, with the right person, that it'd turn out okay, (I'm looking at you, Chris.) but in general, not having the ability to say "Uh, no, it's my company, we're doing it my way." is something I'm loathe to give up.

Now, I don't think this is necessarily a bad thing; For as long as I've been running my company, I've had excellent people helping me. If you can hire smart, you can get talent cheap. And let's be honest; no other sane person would have stuck with me for the four years I took bringing prgmr.com into profitability. If I had taken on a co-founder rather than just paying people, the company would have died a long time ago.

However, I think that investors might be on to something when they filter me out; I mean, I would have the exact same problems with investors as I'd have with co-founders. (this is causing some problems now that my bottleneck is capital rather than marketing or anything else.)