Buying traffic does little in my opinion. And I've purchased over a few thousand hits.
I get some clicks... but no sign ups. Except for one free sign up (= crapola).
Gallery submitting seems to be the key.
Also, it helps to build something that keep users stuck to your page.
I recently built
www.cuntcabin.com/movies.php
The page was up for less than a day and already somebody spent an hour and a half jacking off to dozens of the movies I have online.
Naturally, I put Fling ads on there right away.
I'm just gonna sit back and see how this will pan out.