hmm the big publishers push content on all platforms, the best publishers push content on one platform (iOS ofc, on rare occasions just fire, or just arc)
now dual OS on tabs will help only if an app from one OS runs better than a comparable app from another OS... currently this is simply not the case, Asphalt, doodle jump, angry birds... and even unknown titles such as orbital are exactly as good on the iOS/ Symbian/Bella/Bada as they are on the Android... as its the hardware and not the ecosystem that decides the performance. So more or less the OS on apps is a superficial difference, the only place where it does have an impact is the checkout system. so basically, what you are demanding is that all tab marketplaces allow you to check out applications from competing marketplaces... totally agree with that, that is something you would expect from your tab it was any other thing, you can use any powder in your washing machine, or pay for steam on your desktop... in which case ppl wud prolly buy the same app from the droid marketplace than the iOS
the fault is actually with android, iOS is a walled garden from the ground up, android.. for an open ecosystem, its pretty pathetic that droids force you to use google checkout, which prevents some service providers from billing for the apps