haha...yes that's a common question. I guess the only catch is that we provide the merchant account and gateway for you, along with the billing app. Cons would be less flexibility for you if you prefer something like auth.net, but the Pros would be substantial cost savings because you dont have so many separate companies involved trying to turn a profit.
I don't buy from any unfamiliar business until I know the catch, even if it's just that you're priced to break into the market.