agree with xzen.

not only is it bad game design that discourages exploration of the game, it would discourage people from wanting to play a game that's already critically tenuous in terms of players. many players have already said that they would not play if an exp/sp loss is implemented. and right now, SE can't afford to push players away, especially since they're so close to the patch that should (hopefully) begin to draw everyone back in.

unfortunately, threads like these which try to inject bad game designs into a game that is already deeply flawed but trying its best to change, are really irresponsible. the OP doesn't even qualify the need for a deterrent. if you're going to make a suggestion then it needs to have a clear purpose, which this idea does not have.

right now we need to be looking at the big picture and to be implementing ideas that improve the future health of the game. the game needs to draw players in, not push them out.