HECK YES. Please explain to me why they make millions of dollars for doing absolutely nothing productive for society.
Arguably, they're actually (incredibly) the very model of productivity in the post-industrial world. Hear me out (I'm not a big fan of pro sports)... a top athlete generates billions in promotional sales. That in turn can keep hundreds or thousands of people in multiple countries around the world employed, making, selling, arbitraging the products, tickets, paraphernalia, that only have market value because of their association with the athlete.
In the post-industrial, developed world, people have their basic needs met, by and large. Therefore the only stable, long term strategy for growth of GDP is to increase the number of monetary turns associated with leisure and the generally unnecessary. Sure, you can grow by meeting the unmet needs of the underdeveloped world, but eventually that well would run dry as the underdeveloped world develops. Then you're left with just developed world, and growth that can only be stimulated via the unnecessary. Athletes are the kings and queens of this market, maybe second only to Miley Cyrus.
As for the money they actually get paid... The money they get paid comes by and large from the fans that chose to support them (and can always withdraw their support and place it elsewhere). To the extent that pro sports teams or organizations are incentivized into a geographical area by tax breaks or city money in helping to pay for a stadium or other real estate needs, the city again by the same argument does so to stimulate allied economic development, including economic product increasing and unnecessary services like restaurants, bars, and night clubs surrounding the park.
Whether you like sports or not, the leisure / luxury / junk markets that athletes stimulate are necessary to continued economic growth, which in turn is necessary in our economic railroad for improving social conditions.
So, unless you can really implement a plan that pulls our train off this railroad, you
need them. The question really is how to prevent economic growth through leisure spending from destroying the planet in the process.