Judging people and wanting them to stay out of your "super awesome RPers-only fort" is a bit much.
Elitist attitude is not something to be proud of; it is a harmful ideology that you belong on a pedestal and others are not valued as high as you or your friends are. Someone can't contribute as much to the RP community as you, so you think they should be barred entirely or thrown out because that makes them a "parasite"?
It is the patience, understanding, and cooperation of a community that makes it strong - we do not live in times that require a "thinning the herd" mentality, especially in regards to an extra curricular in a game.
We are not blindly accepting non-RPers, we are rightfully accepting them. This server and this game were not made for RPers only, and if you're willing to bar "non-RPers", then I assume that attitude will extend to "bad RPers" and "RPers I don't like".
A slippery slope, indeed.