Sorry for bumping this topic but I can't understand : why does anyone want to reset his/her level ?
To restart the whole KF experience. I Have almost 800 hours on KF and i played on more than 300 maps. Now i'm playing all those maps, but on a different difficulty because my perks are not at level 6 (and who knows, i might reach 1600 hours). Beating a map on suicidal with a low level perk is pretty fun and you get the chance to help your friends who just bought the game
Oh and its always nice to beat level 6 players when it comes to killing zeds or even when they cant survive (or the dont have enough ammo to keep up)