A lot of this comes down to the players. These leeches exist because the community permits it to exist.

Kick the tank wearing crafting armor, and kick the dps wearing ilvl 1 accessories at 70.

Let them figure out why on their own, and if it they simply don't know and refuse to figure it out perhaps they'll do us all a favor and quit entirely.

If you help one of these players through any dungeon, at any level, you are part of the problem.