It's the same reason vast majority of mankind is destined to hate their jobs. Elementary economics, supply and demand thing.

Things people like to do (partying, skiing, recreational scuba diving & gawking at fishes, hot air baloon flying, computer games playing, etc) are done for free. Supply of such services is abundant, and consequetnly, their price is low, negative even. If you want to get paid, however, you must do things that suck, things that most of people don't want or can't do (politics, ski lift maintenance, oil rig diving, dog poop removal, computer game programming, etc). The lower the supply, and the higher the demand for certain labour, the higher the price.