This has been brought up and knocked down many times.

A player could keep creating multiple accounts, grinding to a certain level without purchasing anything. Once they reach that level they could buy however many item boxes they can and transfer all the good stuff over to the main account. In a sense it's classed as farming.

make it possible for you to only gift an item every 1 hour and then there would be no farming like you could only gift to other people once an hour or day?