It all depends on what kind of "TGP", where you get traffic from and how you treat it. Porn surfers figure out very fast, that a TGP with nothing but thumbs to FHGs only, is a bad sign. Usually just skim. Then traffic quality will suck.
With a portal of good paysites and not pissing the surfers off, you will likely make money off the portal. And if you guide them to great paysites, you will likely get bookmarkers who sign up to other paysites as well.
Personally, I think value the traffic quality, is more important than value the amount. A 10k "TGP" can easily make more money than a 100k one, if you treat surfers well. Additionally, if you are very selective about your content instead of thinking amount, you can easily make more than a 200k-300k TGP.
I think the same logic apply to whatever site you run, TGP/MGP/Tube.. in the end, it is not your PR or Alexa ranking that counts, but the size of your bank account.
