I didn't actually think of 3 key advantages, just figured that would be one of the top three. Probably if I was to list others, they would be willingness to trawl through a lot of ideas before finding one and implementing it, never giving up unless it really is the rational thing to do (the flip side of the original advantage), and coding ability. (Although this guy still freaks me out: http://weblog.markbao.com/2008/how-i-built-a-webapp-in-18-hours-for-699/)

Quite often I'll find out someone is working on one of these ideas, and my immediate reaction is... relief. Relief, because I found out early enough not to waste my time. But, more than that, I look at my list of ideas like an orphanage: I'm always happy when one of them finds a loving parent =p

I think people often suck at following through.