I wear them. White for football, black for basketball, and full-length gray ones for baseball.
I find it gives me more support in the thighs and also gives me more support in another way
Also, it eliminates any of the potential chafing from the pants. I wear long socks in basketball, long socks in football (obviously), and tights in baseball so very little of the pant legs ever contact my skin.
I'd feel quite naked without them.
Rich