Why is this limited to groceries? I don't want to pay a different price than others for any category of item, not just groceries.
Should gyms be able to charge me more based on my weight? Should airlines charge me more because they know I need to travel urgently? Should pharmacies charge me more for medication because they know I have a chronic condition? Should an online retailer charge me more because my browsing history suggests I'm willing to pay a premium? Should insurance companies charge me more because they know I'm unlikely to shop around?
Should gyms be able to charge me more based on my weight? Should airlines charge me more because they know I need to travel urgently? Should pharmacies charge me more for medication because they know I have a chronic condition? Should an online retailer charge me more because my browsing history suggests I'm willing to pay a premium? Should insurance companies charge me more because they know I'm unlikely to shop around?