Why would they quit? you're thinking that absolutely everyone that uses the jump potion will just do bad on the game and quit, but why that doesn't happen on wow that have the same system? I don't see wow empty cause people used a potion to get more level and in wow you receive a potion for free when you buy the expansion, so absolutely every new player is using a potion and still wow is not empty...
And about the community, if they start to judge others cause of that, it's cause its just a bad community that go judging other ppl without knowing them and their potential.