"Being able to do exactly what you want with a thing you paid for" is a very different angle of argument to "knowing it allows Apple to heavily tax all AppStore developers"

I was tackling why I don't think that argument holds water with the average person.

"now the greedy company won't let me do what I want with it unless I buy their overpriced add-on"

With printers this is very tangible to the customer, with the App Store what you're describing here isn't as tangible because nothing on the App Store is actually expensive, it's either free or relatively cheap and it's more a case that the user pays little or nothing, Apple gets a cut for doing close to nothing and the dev gets screwed, printers is more the customer gets screwed.