well that also depends on the server your on and selling... Im playing on 10 servers. and playing both factions. And on top of that I keep a stock of 100k+ in a guild bank on each character, each faction, per server.
not many people have other options than using chinese buyers :\
Chinese Gold Selling sites sell 10K for $25-30. That's 2.5-3 per k, why would you settle with for crap? My friend was able to get Precious from OC to buy his gold for $1.1 per K. He was able to so that because he actively purchases RAF time from her