Nope. In fact, most of the time if a person is causing trouble for their teammates, doing stupid things, or intentionally not contributing it's exactly because they simply don't care very much what the outcome is.
Cause everyone wants to beat the game, right?I think this is exactly the wrong idea. Players will mess around more the less consequence and interest the game maintains. A fairly slow paced game like WoW is not going to keep a player's attention all the time, so you'll inevitably have people playing games inside the game. The highly repetitive nature of WoW doesn't help. I would guess that it applies less so to Left 4 Dead, but it's much the same thing. L4D was awesome, scary, and intense the first (and perhaps second) play through each level, but by the time you've played each level 5 or 6 times, they get a bit mundane (personally, I think this is because of the linearity). Cue the griefers.
I think it might not be possible?
And only thing they can do to make it less destructive when you get griefed is to make the game as casual as possible... no penalties for losing.. just small almost meaningless rewards for winning.. just some fun gameplay you can get into and be done with in a few mins.
My suggestion would be, if you're really worried about people not taking your game seriously, eliminate unnecessary repetition, and produce more exciting content. When a player is having a great time, their much less likely to try and ruin someone else's.
I don't agree becuase as u said... griefers are not playing to win... they enjoy ruining others fun.
So if you add death penalties to the game.. the griefers will be able to do even more harm by sabotaging the team.
And this would be too much harm for the normal players to keep playing.. because there's nothing they could do then to stop dying constantly because of griefers and losing their progress.
Even players that enjoy death penalties would probably quit just because there's nothing they can do about it.. they get automatically teamed with a griefer... now they die.
Thats why I think it needs to be very casual game where the victim of griefers can just say "that asshole... oh well *shrug* next game, hopefully no griefer this time"