Because the Czechs don't belong to the Eurozone, you stumblefuck.

Good luck being the stupid Americano wandering around Prague offering to fuck girls in the shitpipe for 1,000 koruna. You think they are completely stupid? The Euro:koruna rate is 27:1. Maybe you should offer to pay them in bitcoins or Armenian florins as compensation. I bet that would impress them.

Dumbass. Go back to the midwest and shut up.