It called the dot com culture AND the fact they have an overwhelming number of sellers to take your place. This is what facilitates this type of behavior.
Your not the only one and its been going on for a long time. The ones really getting burned are the ones buying sponsored ads and continue to buy sponsored ads with all the distraction of other items on the page.
At one time I raised the price of one product, they place “lower priced” items I might like at the top of the detail page.