You have to factor in the cognitive load of dealing with bitcoin and all that it entails, currency risk, regulatory headaches, banks and other financial institutions reacting negatively to your bitcoin exposure; not to mention the not inconsiderable security exposure you have to manage of having a valuable string of bits that must be secured and backed up and guarded from exposure.

Bitcoin is not cost-free, and right at the moment, it represents more risk than most legitimate businesses are willing to assume. This is not to say that bitcoin doesn't have benefits, it certainly does; but those benefits don't come for free.

A larger percentage of a much smaller pie... isn't a good thing, considering how small the "jailbroken paid apps" pie is right now.