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this gold-farmer thing is true if you could directly just give away plat anytime. but what about the option of giving plat ONLY when you initially buy it? after paying for it you get the option of gifting it and maybe a little message to boot :D
lets see how it could be farmed... scammer buys plat, sells for gold. uses gold to buy plat off some noob for less(gives gold after the 'donation') BUT after that one scam they are unable to sell it or move it at all!
this way you could actually have a working platinum auction house. the good thing about the auction too is that it would be harder to scam people for plat since you can see all the other prices. sure, you could have private auctions with passwords just to sell between guild/friends.