You can vary things a lot, especially on the galleries - I have over 30 different gallery templates, each one has spots for 16 pics. I can easily change them to 14 or 12 or 10 pics & change the look of each one.
You can just have 3 pics, 3 pics, 3 pics, ad, 3 pics, 3 pics
OR
3 pics, 3 pics, ad, 3 pics, 3 pics, 3 pics
It's not gonna cut it
Surfers are gonna see it too - especially with the cumshot sites - if the surfer sees your site & thinks to himself that he's already seen it, back he goes to the link list & on to another site.