Crazy Foreign Currency

So I'm in Prague (duh), and we've all run into this problem.

First of all, their currency is the Koruna, or the "crown". Even though they're in the EU, they don't use Euros.
The exchange rate is approximately 18 koruna = 1 dollar. It is so strange. They also use tons of coins. There is a 50 koruna coin, which is basically a coin that's worth almost three dollars. I'm used to coins basically being worthless, except for parking meters.

The bills are so large here, it feels like play money. I'm having SUCH a hard time keeping track of what I'm spending. When a pizza is 145 koruna and a water is 12 koruna, etc., I just have no idea what is going out of my wallet. It's like playing with monopoly money.

So that's kinda weird, but it's fine...
here's my big gripe with the koruna... when you go to the ATM to withdraw cash, they only give you GIANT bills! Then you go to a store or a restaurant, and they won't break the giant bill! It's so frustrating.
Yesterday I went to the ATM and took out 5,000 koruna. (I try to take out as much at one time so that I only have to pay the converstion fee as little as possible, but at the same time I don't want to be carrying a lot of cash on me in case something happens... fine line to balance!). Anyway, I went to withdraw 5000 koruna, and the ATM gave me two 2,000 koruna bills and a 1,000 koruna bill. That would be like going to an ATM and withdrawing 250 bucks (approx), and getting two $100 bills and a $50 bill. Then trying to go buy a bottle of water with a $100 bill. No one will break that!
It's so annoying!
Is this a conspiracy against tourists? I don't want to keep using my debit or credit cards because the banks charge a 3% conversion fee for that, and it adds up quickly!
SO anyway, that's my little gripe for the day.

Also - this is my 200th post! Whooohooo! Thanks for reading my randomness.
Hope everyone had a wonderful weekend and has a great week!