My three comments a) Payment friction is a big problem here; reviewing comments, I love the idea of overcoming that with an app, but there are also other marke

My three comments a) Payment friction is a big problem here; reviewing comments, I love the idea of overcoming that with an app, but there are also other marketplaces like google chrome apps, etc. Nothing to say you can't sell a web app through one of those right now. b) Don't email survey your customers, call them. Well, in your case, email them and say you're the founder, you want to know what they liked / didn't, and do they have 10 minutes to give you some advice? This will get you far more than automated surveys c) I'm kind of thinking a nice "Before / After" with someone's actual inbox would be nice, then they could just click to pay once they see how great it will look.