Originally Posted by bangman

It really depends what TGP and how much traffic the TGP sends out to galls.
What do you mean by Top 10? The Sextracker Top?

Let's say you get a top spot at a decent size TGP, and you get about 20k clicks to your gallery daily. If your CTR is 5%, you will get 1000 click-throughs to your tour. Assuming you are converting at 1:300 or so, you will get roughly 3 sales a day - 90 sales a month.
VERY rough estimate. It all depends on....well....everything.

Elaborate and I will be able to give you a better estimate.