One possible motivation is some sort of sense of community and how veterans may view this sub as a hovel for new users, whom they dislike on principle. I sort of get that, given the amount of idiots that have joined as post-Mergers. However, a quick look at the CWC sub reveals that there are absolute idiots who have had accounts for many years, yet they seem to be tolerated. So, I don't find this to be a very reasonable approach, and in my eyes seems to insinuate some feeling of entitlement from some of those users, which is of course very gay for obvious reasons.
There are, of course, a few individuals who seem to be particularly MATI because of the TAH incident, SpookyBones in particular, etc. I don't find their opinions to be of any value but that's just me. Yea, some shitty in-house drama went down, but they chose to get involved and mad about it, I feel that's on them.