There is no penalty within the UDRP itself for RDNH - it is simply a moral victory. One could try to parlay that into a civil complaint for tortious interference with contract, defamation, or some other cause of action, but you never know what some judge might do once she or he gets their hands on the dispute. The other side could, of course, counterclaim for cybersquatting (see, e.g. the bouncing ball in the Virtual Works vw.net case a few years back).
Now THERE is a good plan -- insult the very people who may be your judges some day.
Heh... I've had half a mind to do something like that for a while now.
For a brief period a few years ago, I had a hall of shame at loserlawyers.com, but there were so many candidates bucking to get in that I gave it up.
If you really want to see looney litigation, check out the longstanding feud between Ralph Lauren and the US Polo Association (the people that ride horses and hit balls with hammers).