Is there any license that makes software free (as in beer) for contributors/maintainers and paid for everyone else? This way it would be possible to alleviate the free riding problem while providing a mechanism to use software free of charge.
Maybe this could work with networks of projects, so contributing to numpy would let you use scipy for free.
Add exceptions to personal/non commercial use if necessary. Something like that
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At this point you're operating a propietary software company that offers a "contribute and get the software for free" perk. You need to manage access to your closed source code and decide what is a viable contribution, etc. Sounds to me like this would have the potential to be a PR and legal nightmare.