Auction House in Gadgetzan

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Is there any reason why it's so high in Gadgetzan? Perhaps to make money transfers, like the one I have in mind, unattractive?
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Indeed, this is so high to prevent money transfers. The fee is 15%. as Xanthix said, the best way to transfer money is to transfer items. Check the prices from both AH, there are some items that have different prices depending the faction.
In my server for example the arcane crystals cost more horde side than alliance, so if you want to transfer from alliance to horde, you just buy the crystals and transfer them for 1s, thus almost no fee paid. then sell them horde side cheap and get the money you invested back, with maybe some win.