From what I've heard, working for a cycletouring company is like a combination of:
>> chambermaid - you'll be picking up after everyone and cleaning, etc.
>> cook and dishwasher - you'll be the one preparing the meals and cleaning up afterwards
>> counsellor - you'll be the one everyone comes to when they have difficulties with the other people on the tour
>> driver - you'll likely have to spend some time driving the sag wagon
>> sheep herder - you'll have to herd everyone along which probably means riding really slowly behind that last person
>> encourager - you've got to keep everyone's spirits up!
>> teacher - you'll need to instruct the people on all sorts of bicycle, fitness, and nutritional aspects of cycling
>> babysitter/daycare worker - tired, inexperienced cyclists will act like 2 year olds.
And no, it doesn't pay very well ... also from what I've heard, it pays anywhere from nothing (volunteer work), to having just your accommodations and food taken care of, to about minimum wage.
I'm still toying with the idea of doing something like that myself for a summer, just for the experience ... but aside from "the experience", I'm not sure what the pros of doing something like this would be.