in the long term you end up paying more because of all the returns. all for the privilege of being abused by countless fake and incorrect listings trying to fool you when trying to but something (with a 25% change the you will wait, spend time to return, and still not have the item)
yet you claim that you move away from sites that merely annoy you with ads. I'm highly skeptical.
that's why you have all those reward cards, programs and such.