[passion__desire]

I don't understanding why would we need to having similar expectations from systems that we have from humans and building a whole theory on it. I can adjust my behaviour around systems. I am not restricted to operate within default values. e.g Whenever a price is listed as $99, I automatically know it is $100. Marketing gimmicks don't work once you know about them or in other words, expectations can be set in a new environment.

[fragmede]

Marketing gimmicks absolutely still work even if you know about them because they take advantage of basic human psychology so when you're tired/hungry/sleepy or otherwise not operating at peak performance, your lizard brain/autopilot takes over and you choose what's been chosen for you.

[passion__desire]

There was a story where users complained that a particular process is taking lot of time. He coded a progress bar and all the complaints disappeared because it set their expectations and it was visible.