Interesting. I'm rolling out and testing a tool that lets restaurants create and sell their own Groupon-like daily deals from their Facebook page (using their own Stripe acct).
Sounds interesting. One thing to consider is that part of groupons pitch is that they will drive customers that don't know about the business to the business. Don't give up, but do think of a way to get that function as part of your value prop.
Maybe it won't work ... we'll see