Hun,
I didnt mean for you to make money off it.. I just mean $5.00 a month to take submissions from a webmaster isnt exactly making money

but it would be getting identity and getting "real" submitters. I think just getting the credit card authorization would be enough to seperate them from the real cheaters.
Take the $5.00 from each webmaster and give away prizes, Im sure that would go over ok.
I think you would get minimal complaints and may even get better submissions.. my point is that trying to pool it I think you would have more headache than your project would accomplish.
Chris