I think there are lots of it especially in products. Like sometimes, people would say it's $9.99 but if you really think about it it's basically just ten dollars. I feel like the way the brain reacts when they see the single digit value makes them think it's cheap. Also, something that I think is a gimmick is how some pre-workout supplements add different amino acids on their product but if you look at its supplement facts or nutrition facts, it's just either underdosed, or just some kind of a filler. Others would even hide it as a proprietary blend. What kind of product gimmick can you think of that people still buy into?