I've always viewed TGPs as a matter of quantity over quality... low conversions countered with the prospect for mass amounts of traffic.

*shrugs*

I can't say, though, that I've ever really put much weight behind TGPs as my early experiences with them didn't produce a whole helluva lot. I do promote one site through TGPs - a free site. In the hopes that surfers looking for free porn (as they do on TGPs) will recognize another opportunity for free porn and bookmark me/become regular visitors to my site. Just gotta be willing and able to sacrifice the bandwidth an effort towards those aims.

I can't help but get the feeling, though, that so many TGP surfers are so conditioned to peruse the free porn in the places they're used to having it brought to them (the particular galleries they frequent) and avoid what they know ends in a request for $$ that the conversion ratio of TGPs is very low.

Some others here might have had a totally different experience with them, though.