Im not sure a gas station analogy really works. I use a gas station out of convenience (i.e. its on my route) and will only go out of my way for a significant difference in price. This means i go to the same gas stations even when there are others that are “as good as” around just because it’s convenient for me. Similarly if i already setup an account with Amazon and currently use Amazon i won’t move to an “as good as” competitor just because its an inconvenience to setup a new account, add billing info, add my address, etc… for no real improvement.