Personally, I own many dozens of iOS apps, several of which are on the more expensive side (relative to most). Disregarding that most of these apps simply aren’t even available on Android, having to buy them all again would be quite costly. Either way, though, none of the apps you own on one platform will come with you to the next one.
Whenever people talk to me about Android, and would I switch, and why I won’t consider it I tell them that at this point, it has less to do with the hardware and more to do with the software that I have invested in.
It’s both the combination of money spent and the way that many of these applications fit into my workflow and routine.