because it's pointless. it will encourage nothing more than more rank-whoring, this time because there is a point.

it won't encourage new players to stay, because they'll be weaker when they begin, thus they'll get killed easier. thus they'll ragequit.

the people who stay to level up will be the same people who would stay and get better at cading normally.

in short it does absolutely nothing for the server, and only inserts an additional layer of mods that could break and destabilize shit.