GA is the keys to the kingdom for an online business...conversions, cash flow, ad sense, ad words...it is all there. You'll also need to offer a very clear and compelling value-add over Google Analytics for a serious person to even consider it. Heck, I don't even use 1/2 of the stuff GA gives me-- why do I need another service? You've got to answer that question.

You should also charge money for the service....I'd actually feel more comfortable about using it.

Also, the site lacks basic things like a location address, privacy policy, an obvious About Us page, and a TOS that protects my data.