If you take a look on at my site
http://www.femdom-site-reviews.com you will see that there are categories for sites (subniche categories).
I am not sure is it smart to add new categories for price range (for example sites below 20, up to 30, and above) also?
Is this smart move regarding your opinion? ( I don't know will people spend money depending how much they have or will buy sites because they like them and won't ask for a price)
thanks