Yes. Some 'smaller' TGPs can even make more money than the bigger ones. Or at least when you sum up the traffic, they make more together.
The key is not to list a bunch of galleries every day and skim hard, only to get bad quality traffic out/in. It's much better to list fewer galleries, but for longer period of time; most surfers are not daily returners, and a productive ratio of 1:200 is always better than a TGP with twice the traffic but 1:500. Shame the new TGP "generation" don't realize that. Try it
