1) App makers could easily decide to "port" your registration to the Android or Windows Mobile markets and not make you pay again -- or give you a considerable discount perhaps.
However, Apple has also made a concerted effort to be very sticky with their App developers. They block almost any development of iPhone OS apps in any meaningfully cross-platform development tool or language. So you won't find the same 'app makers' on the other mobile platforms, except in the case of the big established 'flagship' products like QuickOffice.
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However, Apple has also made a concerted effort to be very sticky with their App developers. They block almost any development of iPhone OS apps in any meaningfully cross-platform development tool or language. So you won't find the same 'app makers' on the other mobile platforms, except in the case of the big established 'flagship' products like QuickOffice.