I think this is a great call. I'll be investing time into trying your service out now that I know that if you guys ever need to disappear or your pricing model becomes incompatible I'll have another choice.
I'm curious: How's Simperium different from Parse.com?
Out of interest, is there any research to back the idea of selling your product at the same time as giving it away for free ultimately results in higher sales? A trade-off between exposure and "lost" sales I guess?