I think your biggest issue would be gaining trust for new users. It is a fact most people will be doubthful atfirst. Other than that, it is hard to say wether it would work or not. Obviously it was never tried before.
Thanks you! Best answer here! Never tried so how would it be a ponzi! Thank you for the feedback!
Ofcourse if you build up trust it will be more easy for you to accomplish your target & one of best way to build trust is free membership as i said in my last post.