A nice thought. But offering a reward will mostly bring in people who are there strcitly for the reward, which usually mean a lot of yelling.
A way around this, at least a little, would be to add a system like player comms, specifically for helping pf parties. That way if you show up to abuse people and get a reward, it doesn't work. People would find ways around it, they always do, but that would probably be by forming your own parties and comm trading, but that wouldnt effect the real learning parties.