"I'm okay with selling stuff, but it's not tolerable being harrased, "Suggested" to buy evey five seconds"

Harrassed? I don't see that at all. Renderosity is more than just free stuff, forums and galleries. Anyone with a bit of talent can make a bit of money on this hobby they love.
Unless you're on a dinosaur of a computer it's not that bad. Try clearing your cachet or defraging and see if your system runs better.

Personally, I love seeing whats new. I end up clicking on at least 2 banners a day.

...... Kendra