“One argument I’ve heard is that Apple is, in theory, acting in the customer’s best long-term interest here: iTunes is an easier payment method than Amazon’s Kindle store, so Apple should try to pressure companies to use iTunes for everything over the long run.”
Has this guy used the Kindle Store? Once you have an account set up, and who hasn’t had an Amazon account for a decade, all you have to do is click buy. I don’t think it’s a huge argument that it for sure isn’t any harder then iTunes.
After all this is the company that holds the patent on buying things with “1-Click”!