I think what you suggest would amount to selling commodities within the game for money or money's worth---which is not allowed by the Terms of Use:
"Real World Trading
You may not advertise the intent to or commit the act of buying (excluding direct purchases from Hunted Cow Studios Ltd), selling, trading, sharing, or transferring access to any game account, game points or any other commodities within the game for money, money's worth or commodities out with the game. Game accounts are non-transferrable under any circumstances. All game accounts, characters, items, game points, and other commodities within the game are the sole property of Hunted Cow Studios Ltd. The selling for money or trading of any these items is a breach of this Agreement."
(Of course, I'd be happy for HCS to produce a more authoritative interpretation.)