Frankly, having read through a number of the user in question's posts, I'm ok with that, but I don't think it'll work. He seems to get his karma from rationality quote posting, which is a powerful karma generator. His actual comments are IMHO rarely worthy of an upvote and often deserving of a downvote, but he gains much karma from posting other people's brilliance.

This is in general problem. There are other users who seem to do this also, but they don't post as frequently so it hasn't created as much of a problem. But in this particular case, it may also be instructive to look at where the quotes are coming from. A fundamental idea behind the rationality quotes is that rational thinking should be taken from wherever one finds it. And in the past there have been well-received quotes even from Jack Chick and the Unabomber. But, in this particular instance, a large section of the quotes come from people involved in a specific end of American politics. That may indicate further problems given the consistent nature of who is being quoted. It looks like they may see the quote threads as further opportunity to advertise their preferred politics an political writers.