For me it's not about the percentage, it's that it is a monopoly. If I make an iPad app, my only route to market is Apple.

That is before I get into my personal objection to having to ask permission to put software on a computer I bought. I own an iPad but I can't just install anything I want on it, Apple needs to approve the software first. For me that's just anti-creative and anti-everying-I-love-about-computers.

All I really want as a software developer is to be able to write software and have people use it if they choose to. I don't want Apple or any other company inserted as a middle-man.