You have to quest and kill quite a few despicable hordes to get enough gold.You can also sell items you produce, in an auction house. The rarer the item you sell, the more gold you can ask for.
Airwolf and CatMint
My char, Airwolf, is a poor level 100 Nightelf Hunter with a sabretooth pet, CatMint. He has almost 35 000 gold coins in his treasure chest, and that would have made him a rich elf in many a realm. Quite a lot do you think? Not so… for in real life on the black market you can buy 35 000 gold for 180 NOK (20 Euro/25 US$), i.e. 1 000 gold are worth 0,50 EUR/0,75 US$/3,90 NOK. But gold is where you find it, and easy to spend both in virtual worlds and real life. :-)