"You can give your players incentive to do things, but if it’s not the incentive they’re looking for they will probably demonstrate it by their in game actions. Some examples of player incentives include:
Loot
Treasure
Money
Riches
Gold
Lucre
Boodle
Booty
Dough
Graft
Goods
Items
Moolah
Pillage
Plunder
Prizes
Spoils
Swag
Bling
" ~Shamus