"Wasted opportunity" joke

An couple decided to stay at a very exclusive, WASP only
hotel for a night. The manager immediately recognized them for
what they are but could not throw them out, instead he decided
to be clever. In the morning the couple came to settle the bill
and were surprised to find they owe $3000.
"How's this? We've only been here one night!" the man was annoyed.
"So?" said the manager, "This is a very expensive hotel. We have
golf courts, tennis courts, swimming pools, exercise rooms, bars
and restaurants, all this is very expensive to keep up."
"But we didn't use any of these!" explained the couple.
"If you didn't use-that's your problem," came the reply.
"In that case, you owe me $2000. You see, my wife is a call girl
who charges $5000 a night, so please settle your bill," said the
man.
"What do you mean?" the manager was taken off guard, "I didn't
sleep with your wife!"
"If you didn't use-that's your problem!"
Alexander Pruss, at one of: Department of Applied Mathematics,
Astronomy, Mathematics, or Physics / University of Western Ontario