On the CN live race report for Stage 7, they related this info about what the rider's make on intermediate climbs and the KOM jersey:
cyclingnews said:Prize money for the climbs: For an HC climb, the first three get cold hard cash – 800, 450 and 300 euro. For a cat 1, it is 650, 400 and 150. For a cat 2 only two get money (500 and 250). The first rider over a cat 3 will get 300. The first over a cat 4 200. So don't quit your day job yet!
Unless you think you are so gifted you can take out the polka dot in the end. Then 30,350 euro are yours! Each day a rider wears the polka dot they also get some money. So the total prize money that can be taken out is 101,350, in three weeks. So, yeah, if you think you are stellar climber, maybe you *should* quit your day job!
It doesn't seem like much for such a big race.