25% of Amazon vacuum listings ran fake discounts

The trick is simple. Raise the price for a week or two, then relist it at the "discounted" price, which is actually just the normal price with a strikethrough next to a number that never really existed. You feel like you got a deal. You didn't.

What got me thinking about this: the products doing it best aren't obviously sketchy. Good ratings, real-looking reviews, established sellers. The fake discount is often the only tell, and most people don't check price history before buying.

Curious what other categories people have caught doing this. Electronics? Kitchen stuff? Anyone actually track price history before buying now, or is that too much effort for a $40 item?