I made this account a while back, mostly been leeching from it but I thought Id contribute for a change, give somethin' back you know?
Anyway, take Beyond-WoW's server for example, they insist that you have vote to earn your gold, well below is a gold trick I found.
Trade all ur current gold away, but leave yourself 18 - 20 copper, and because most servers have shops, go buy yourself a Blacksmith Hammer from a Blacksmith Vendor.
Sell back to the vendor and you get somewhere between 425k to 450k
Its not a common bug/exploit as not many people ever keep 18 copper on them at anyone time.. especially if there going to buy a BS hammer ;-)