Because the painting is a fetishized commodity that rich people use to display their wealth, and is not priced according to how much labor it took to create. In other words, it's a rip-off.
Because the value of sports in society has been displaced from the effort it takes to play them, and is primarily derived from the usefulness they serve as vehicles for advertising. In other words, basketball players are grossly overpaid.
In principle, there's an amount of labor time that, on average, any given thing will take to produce under average conditions using whatever resources are available. You might recall this from my previous post. Things that take longer tend to cost more, and when innovations are created that make them take less labor time, the price tends to drop. When conditions make it so that it takes more labor time to produce the same thing, such as when there is a shortage of something required to use the innovation, price tends to climb again. It's not the whole picture, because the theory is not an explanation of price but of value, which itself is only a basis or starting point for price.
Because he's fucking exorbitantly, absurdly overpaid, and the theory of value that lets you say that and show why it's true is mine, not yours. Yours is the one that silences any notion that Tiger Woods shouldn't have as much money as a small town just because he's a womanizing golfer.
I bet you've read the covers of so many books on Marxian economics.