Let’s do the math: 0 items cost 0 money. So that’s what you pay.

0 items cost 0 money. That’s what you would pay without the offer. 0 times 50% is 0 money, as the sign says.

I see nothing wrong with the logic. I guess OP just doesn’t understand math or preys upon people who don’t.

Fine I didn’t want one anyway

Cue confused customers not sure how to get the sale and completely not understanding the concept of buying zero means not buying anything.

buy 0, get -1

So if I buy three , how much is that divided by 0?

This may be the only case of “you’ll own nothing and you will like it” that I can agree with.