Kinda want to echo this. There's _so many_ projects that I could participate in, yours would have to be a pretty unique one for me to be interested.

But that being said, it's not impossible. The people I've done 'fun, not for profit' projects with tend to be with friends, but I can see myself getting interested if your project has something that scratches a real itch for me ;)

You could also consider finding 'hack nights' in your city. You might find people there looking for projects.

Or you can decide to pay for work.