What I've observed is that evil Rps are just that much more fun to do, if done well. There are opportunities for brawls, hunts, attacks, wars and torturing that do not come up in the usual ones as they are viewed as 'not-noble/brave/kind/selfless' (which some are, and irl I'm not actually going to come after someone with a sword, don't worry XD).
I find it slightly insulting that evil RPs have been given the lable 'filled with powerplayers' because this isn't true... I mean don't get me wrong they ARE out there and they ARE annoying as hell, but not ALL people are. I just... geez.
I know of evil Rps that will whisper the leader of a group to make sure they want to be 'attacked' and the 'evil' players will whisper others to ask if they can 'wound' or 'kill' the opposing 'good' side. It's not really a bad thing that evil RPs are on the rise, in my personal opinion, because they add to the IC drama, and make a night on FH more interesting. There is only so much you can do before you are longing for bad to come creeping in to make things interesting (unless really well plotted/variety of characters).
The only problem I can see is if there are more evil RPs than anything else, because then everything is the same and it's boring.