Re: How many guys can dunk in your local court (10 ft) in games?
In pick-up games: almost never.
Summer league games: Pretty often, probably a handful every night.
The summer league that I've played in before usually has some pretty serious competition so dunking isn't rare. Top former HS players, college players home for the summer, and even former Pitt players will play in it. For example the one team a couple years ago had Chevy Troutman, Julius Page, and Yuri Demetris on it.