If you build a great app and you market it well, there's no reason why you wouldn't succeed. Of course the competition will be hard, but at least you are target

If you build a great app and you market it well, there's no reason why you wouldn't succeed. Of course the competition will be hard, but at least you are targeting an audience with a credit card already on file and one password away from a purchase. Think about web apps, you are competing with millions of other sites and you are also asking your user to go get the credit card, punch in 16 digits, billing address and so. Lot of time to change their mind.