Because many users are on tinder just for validation, and getting matches makes them feel good. They're willing to pay for it, so Match is willing to take their money at the cost of UX
Sometimes people want to match with someone in the town they're visiting (or moving to) soon.
Other times, people in poorer countries are trying to match with people in richer countries. Think of Tinder as acting as a broker in a situation that sometimes people call "mail order bride."