well i only have 2k right now. Because what i do is, i buy the new donation items at least one every month. and how i get that money? well i sell some of my other donation items that i don't use. gaia's new gold system sucks. before you could of poll whored. now i think the only way to beat the system is through the market place, that i buy things at low prices and sell them back at higher prices. thats how i get my gold. items that look promising, the prices would eventually rise on them.
Or
you can play the games on gaia and sell the tickets. Some ppl on gaia wow, they buy those tickets so quickly. And you make huge profits. Or you can go fishing. and sell the fishes back to the guy in the shops.
Thats all i know so far.
I would be rich on gaia, but i got exams now, and these things take time. The marketing one, is famous and not very time consuming.