Think of the people in your life not quite as tech-savvy as yourself, like maybe your next-door neighbour or your mother. Would you expect them not to be misled by this? Sure, I'd hope my mother would be critical enough to notice, but I can easily see it happen otherwise.
Another indication is, I assume that a lot of people who do notice will instead decide to bail out entirely and not buy anything, rather than (like I would do, if I really wanted the item) pay, log in, and cancel the account immediately. Because that's not really an obvious thing to do, given the set expectation of being a regular online shopping store.