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Re:How Apple badly messed up with in-app purchases on Lion a... by stottc on Tuesday September 20, 2011 @10:12PM (#3020439)
There's an option to do server-side receipt validation. That should prevent a hack like that.
Re:How Apple badly messed up with in-app purchases on Lion a... by reitzensteinm on Tuesday September 20, 2011 @11:32PM (#3020633)
Also, checking for the purchase status of an item that can't be bought would be a cheap and easy place to start.

Easy to get around with a custom crack, but it should actually be pretty effective against a blanket 'just return yes' crack.