I play and DM. I run a few games, but I do a ton of campaign building work. (Names, linguistics, maps, history. I am something of an amateure linguist, historian, and mythology buff.)
I do both. I will run an adventure and when that one is completed then my nephew runs his adventure. We switch back and forth. In the game I run the characters are all 6th level at this time and in the game my nephew runs the characters range from 8th to 10th.
Thats sorta my point. I think more of the DM's are posting and reading the boards. I find it just as useful for a player to be on here. But I guess, there are more resources for an active Dm