Filtering Surfers To A Niche From A Paysite Tour...

So im wondering if any of you folks had any experience in filtering a surfer from one paysite, to another via a sites tour?

I see it done all the time with PPS programs, usually by using a drop down box with something like 'looking for something else' in it for the text.

I was wondering if anyone had tried this method of filtering paysite traffic even more and, if you had, did you notice any additional revenues being generated from this?

Regards,

Lee