No. You could then say "how many NIC manufacturers" or "how many UTP cable manufacturers" etc., as though all of them got their cut from Apple's app store (although one could reasonably argue it is true).
If it is the same, why doesn't Apple allow third party stores even to re-sell apps from app store, competing on price and convenience? As this is what Sony does.
I'm by no means fan of Sony, but these are two completely different situations.