I think a key difference is that there's only a few regular FES affiliated posters here, whereas there are dozens of RE posters, many of which will post maybe a hundred times and never be seen again. A thread full of new posters making jabs like this would be an eyesore, but even if every single FES poster did this in a thread, it wouldn't even take up a whole page.
It's not so much about keeping individual posters in line sometimes, as much as it is about keeping the entire forum in check. New posters can accumulate garbage posts very fast, but regular posters would take quite some time to impart the same effect.