I have an idea for a program that is worth writing but I can't afford to pay anyone...?

I have a (secret) idea for a program, a special CMS made with PHP, but if I wrote it all by myself it would take forever. I'm in full time education so I can't exactly devote my time to it. How do I get a group of developers to work for me on this project without paying them and without divulging too many details? And do people actually pay for easy to use CMSs? How much would you pay if it made it really easy?