Some people do. What's the harm in letting them? Perlmonks isn't exactly a zero-sum game. And if some people use point competition as a motivation, where's the harm? They still have to produce posts worthy of votes (and avoid posts that the community will net downvote). Good posts keeps Perlmonks vibrant.

Until there's concensus that XP is causing a significant problem, I feel that we should just allow that different people are motivated by different things, and move on.