I agree with jwilburn. This plugin is really awesome and I think you deserve receive for your hard work. Sometimes I think I'm stealing from Scirra, because C2 it's really incredible and I paid so little for it. That's why I'm planning in buying another C2 License to support Scirra.
And I hope Clay.io can turn into a profitable business for you too. Maybe something like a Free Edition, with just the Scoreboards and FaceBook and Tweeter. And a Business Edition with all features. I don't know, I'm just wandering...
A friend of mine plays Kingdom Rush, a flash game and they have premium content. According to my friend, they sell pretty good. But their game are on the Apple Store, so I think this helps the publicity. I'm planning on releasing a WebGame with Free and Premium contents using the Clay.io .
Talking about this, Austin, I tried the Payment option and no good. I created an item, with the price 0,00. The API tells me that the item is for free. OKay, but when I choose an option, it's says the Payment process will conclude in another page. Well, the Pay Pal page didn't open neither any other page. So, the Payment system it's already functional or just for test?
Thank for your time and sorry if said something wrong.