I want a cash bar at our wedding
Can you afford a cash bar?
Money should not be a big issue to us. We don't want this thing to get out of hand.
You should do whatever you want to make your wedding special. As long as it's within reason and your fiance is okay with everything, then make choices that'll leave a memorable impression.
What? It's more fun if the bar is free. That is why we will have a cash bar.
That sounds like a great time! I hope your guests behave themselves and no one gets sloppy drunk.