The day Bitcointalk allows animated signatures, is the day I'm going to enable "Don't show users' signatures".
There was a time when bitcointalk had the option to display the animated signatures but thanks to theymos who abandon that feature.
It was so annoying seeing those animations while reading the text.
Moreover, one might ask what the real added value of animated signatures would be? I'm not sure if it's necessary to overload the forum pages with useless info/designs, as the hero/legendary distinction is already made through the forum users's profiles and is clearly visible in every message posted.
Maybe from the company's point of view, animated signatures may add value and may look prominent but from the forum point of view, it is not a good idea. You may still see a few members wearing the old animated signatures. Also, the admin has disabled the signatures which I think is in the best interest of the forum.