We have alot of everything. With over 17,000 folks in PMB we run the gammut. Granted no all 17K send traffic anymore, but we do ok.
We have large TGP guys and gals that religiously send an assload of traffic to our hosted galleries daily to AVS webmasters that use us as upsells in their content areas to folks that just popunder things I've cooked up off search engine traffic.
I'm totally old school, so I don't buy into the whole reward point, upsell, fluff fluff, blah blah blah but that's just me. If you want an IPod fucking buy one.
When I personally go fishing for a new income source to use I do a 10K unique out test and if they don't convert to my liking, they go on the spreadsheet in red. If they convert they stay in the rotation till they don't, then I get a new fishing pole.
It ain't rocket science.