Ensuring a group is composed of competent players

Ensuring a group is composed of competent players (with game knowledge and proper gear) that will not cause a lot of undue stress or a waste of time is not something I would consider elitist. I'd consider that good sense.

If someone isn't great at the game Proving Grounds can actually provide some goals to achieve, in a private wow gold setting, so that they can attempt to improve. Knowing that you have room to improve and being able to mark that improvement is a very positive thing for that player, and the future groups they join.