in a largely unrelated question, isn't it funny how skateboarders film each other all the time when they are skating at the local park, but basketball players never film each other's games in local pickup games?
I can't imagine having a friend tell me "while your waiting for next, can you film this next 3 on 3 game in case I make an awesome post move or behind the back pass?
I don't know man, ever been on YouTube? There's a ton of random videos of people playing ball. Although I agree not to the extent of skaters.
But i think it's the dynamic of the sports. Skaters don't generally tape themselves just skating from point A to point B, but doing tricks. Remember the And1 days, there were tons of people taping themselves trying to do tricks, that's what half the mix tapes consisted of, random entries.
You find a guy at the park trying hard dunks or doing trick shots, I bet you there will be someone there taping him, to the same extent that guys doing skating tricks are taped.
Edit: Ah I see D.o.s. had the same thought as me.