There's also a support and PR cost to that reactivation step - inevitably some people will have changed iTunes accounts or be without an internet connection or something like that and they'll probably be pretty ticked off to even briefly lose access to something they legitimately paid for. I should add, however, that this is a LOT of work - took us a couple of weeks of programmer time to get it operating smoothly, though there's open-source code floating around now that will handle most of steps 2 and 3 for you. In your case, since your app has already been cracked and you're trying to deactivate people who obtained your IAP item illicitly, you'd push this functionality out in a new version of your app, then call a restoreCompletedTransactions the first time the new version was run to re-validate / reactivate purchases for your legitimate users and block everyone else. (see text after EDIT below for some extra verification you need to do now in step 3)
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