Are basketball courts slippery?
If you noticed that in professional basketball courts, you will see a team constantly cleaning the floors that is left by sweat by the players. The reason they do this is because their floor is highly polished in which case the slip factor is at such a level in which water may cause it to become slippery once again.
Why do they wipe the floor in basketball?
They do this to prevent their shoes from getting slippery. It is the same reason they mop the floors near the hoops. It is important that the players have a good grip on the floor, and if their shoes are damp they do not have enough traction. It reduces the risk of injury and helps them to play better.