Oryan77 said:How do you keep players grounded and reasonable when haggling out a reward for a mission?
Why?
I don't stop them from sticking their heads into the mouths of dragons, so why should I worry about how they haggle?
I suspect that you're trying to motivate the PCs to go on an adventure with a reward. The first thing to wonder is whether or not you and the players are metagaming this - the players are using knowledge of your desperation as a DM to demand higher rewards.
Non-metagame considerations for rewards would be the ones you would expect:
1. how much money does the employer have
2. how important is the mission to the employer
3. what other options exist for the employer to accomplish the mission (eg. if pressed can he send his private army, or hire other adventures)
So, for example, if the mission is to save the kingdom and the PCs are the only ones that can do it then I'd expect the PCs to ask for all the wealth of the kingdom? Why not? That's life (though it may not be lawful good - but it certainly would happen IRL)
However - the first step is to play your NPCs according to their interests (saving the kingdom) and not yours (having the PCs go through your adventure)