The simple problem is that most people in f2p pvp are fighting the same way they would in p2p pvp. Ill explain (as stated above there is no KO ability in f2p) yet most of the fights take place just a short distance from safe areas. PVP is very profitable if you leave those areas try pking in the wild again or roam the distances between towns. Mages are effective in these areas if proper technique is used. ie cast bind cast 2 spells run and repeat.