[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.