Not my downvote, but I suspect people don't like the slippery slope argument ("tracking is omnipresent on the web, therefore it's OK to do it in the real world as well").
Then there's "better shopping experiences" which most people's BS translators will read as "worse shopping experiences / persuading people to spend more than they intended".
To be clear, I'm not arguing that it is justified or moral. Whatever you think about 'right' or 'wrong', you have to realize that a person who builds a store is going to want to know everything about how his or her store is used. EVERYTHING. That's not good or evil, that's just logical.
Acting like it should be self evident to a store owner that tracking users is inherently wrong is just ignoring the viewpoint of the store owner wholesale. Does not lead to good policy.
Then there's "better shopping experiences" which most people's BS translators will read as "worse shopping experiences / persuading people to spend more than they intended".