Exactly. You buy one and… you get two :) If only there were words for that… Like… Two-for-(the-price-of-)one or Buy one get one free or Buy one get two :)

doesn’t mean it is any less logical :) but then again, marketing people were never known for excessive logical thinking skills…

the only times I heard it before, it included the clarifying “free”. That was in the - then united - states. " buy one get one" just sounds like either a scam, or tautological…

“Buy one get one deal!"

That’s not a deal, that’s a normal sale. Did they actually phrase it like that? “You pay for 1 item, you get 1 item”? What you mean - and what such a wording might mislead you to believe - is “buy one, get one free” (a.k.a. BOGOF)