Investors/Incubators over-estimate their ability to pick good ideas/startups.
An MVP built by a lone, but talented techie is almost as likely to turn into something 'successful' as a startup on angellist that has: 4 founders, 9 advisors, 13 press releases, 600 followers, etc
Most freelancers will not build and/or follow-through with their ideas, because they perceive their opportunity cost to be too high.
HackerNews has a decent number of talented freelancers with good ideas.
Based on these premises, I present The Proposition [Version 1.0]:
I'll pay you $5000 to build the MVP of that idea you've been kicking around in your head for the last year. Once you're done (ideally within 2 months), you can go back to earning your full potential. At this point, I'll take over and spend an additional $3000 to acquire enough users/customers for us to evaluate the project's likelihood of success. We split the resulting company 50-50, as equal co-founders.