I want to try it out but won't be starting until I see real numbers for fees.  The way it's worded, you can take 100% fees if you wanted.  What is the cap?  And what are the fees if it's running at 0.01BTC/MHs/day?

I mean you just started and already this whole thing is looking pretty shady.  As someone above said, be as transparent as possible.  Worst case, set a fee for now and if you want to change it later, give a 15 day notice or something and change it, that's all.