Bingo. I saw pre-internet confusion on this point from small businesses too. I remember being little and my mom got a coupon at the car wash for a pizza at some nearby place. When we went to use it, the manager turned us down saying, "nah, this is dine-in only, yeah, otherwise we don't make any money off it".

Even at that age, I was like, "wha? But, isn't that the purpose of a promotion? So someone tries your stuff and might come back?" It wasn't like a coupon in the back of a magazine, but something the car wash guy actively promoted.