nostr:npub19mf4jm44umnup4he4cdqrjk3us966qhdnc3zrlpjx93y4x95e3uq9qkfu2 I am a bit confused by cash vouchers?

Is there a reason why not all ATMs can use cash vouchers?

The ATM closest to me doesn’t. Does that mean I’d have to buy at the more expensive rates/spread if I used that one?