There used to be four, two Free, two Pro. It appears that a lot of the server space has been taken up with clan servers now.
I have scouted beginner servers for a good while now, i haven't seen any farming attemps of people of higher ranks on newbie servers. Bear in mind these people may also be ''returning pros'' that need some practice before getting their funk on. Besides, it's only beneficial to fight against a harder opponent once in a while.
Foxbutt out.