It doesn't matter to them if that's how your brain, personally, works. They're playing the percentages. It's how -most people's- brains work. And they're not operating on a one-visit basis.

I like to think that I'm pretty aware of this kind of thing, but I'm also fairly sure I've walked past a product on my odyssey to acquire milk or bread and thought "oh hey I should try that.." then picked it up at a later date. If you asked me why I did that at the time I'm not sure I could have given you a straight answer.

Sure, it's annoying for you. It's annoying for me, too, because it fucking works on me.