All good suggestions.
Don't forget (and I think Pyro is onto it there) that whatever an incentive to perform is, it has to be acheivable, resonable, and most importantly measurable.
Without the measure you get favorites (as jetbrett has aluded to). So this type of thing has to be setup with an open book policy where everyone knows how everyone else is performing (operator / pilot, not necessarily amongst pilots but it's not like people can't talk to each other about their pay...)