When you sit out a game (if you are playing pick-up, sometimes two before you are able to get back on the court) it can be a problem. I wear compression socks that go up my calves for the same reason. I guess if you have problems with your arms you might need the same thing?
I would have had to have played some sort of organized sports at some point in my life to have any idea what you're talking about. Basketball is played indoors. It's usually at least in the 60s inside.