I'm the lead developer at Coinalot.net. I just want to say that we are still looking for people and anyone who's interested can PM me directly.
No sane developer who is worth his salt will even think two seconds about working for free just on the promise of possible reward in case of success.
So called "entrepreneurs" who try adopting the this very model exist like sand on a beach. Everyone has the next great idea and the only thing they need is a developer stupid enough to work their ass off for free in return for shares or some other form of success dependent payment.
You want a developer work for you? Start paying money!
You don't wanna pay a developer? Code it yourself!