On my server, there are a lot of GDKP's.
Typically five a day, for both 10 and 25's of whatever the highest content is.

Similarly, there are very geared/skilled toons who sell a rating in 2's.
Pay them so much, group up and play until you get to whatever.

Blizzard has so many gold sinks in the game.
But there isn't really a shortage of places to spend gold.
Especially with seven teams of toons, in my case (others have more or less).
There's no way I'll gear some of the alt teams, but could take them on GDKP's if I were so inclined.