Yeah exactly what Malcolm said, Just depends on the individual animal. Me personally if i can fit a hide in there and they use it, it stays.
So now out of 7 snakes, all but one have a hide, she will get a hide when in the CB-70 though, i feel that if they use it, leave it. Sometimes ball pythons wont need it or use it, then just take it out. But don't deprive them of it just cause your lazy to clean them or don't like the way it looks.