

90 year old woman goes to the local brothel. She tells the madam that she wants to try something new, so she wants to try being a hooker for a night. Madam makes some phone calls, finds some customers who 'd be into it, and tells the woman to come back the next night.
The next day the lady arrives, and soon the first john shows up. They walk upstairs, spend an hour, and come back. The second customer is waiting, and so he and she go upstairs. After she comes back down, the third guy arrives, so it’s back upstairs.
At the end of the night the madam asks if she wants to come back?
“Oh, no dear. the sex was fine but those damn stairs will kill me.”
In a neighborhood, everyone knows your name. If Joe the Plumber and Fred the Butcher make a bet, everyone has heard it, and the loser has to pay up, or be scorned.
In a bar, the bartender or server holds the bets and pays off the winner, and expects a cut of the pie as a sevice fee/tip.