More than the sticker price? Why?

The merchant pays to open a channel if they want; same as the merchant paying a CC fee (or, ya know, embedding it in the sticker price?)

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>The basic idea is that consumers overpay by sending a UTXO for the product in its entirety, and the retailer returns the change

I must be misunderstanding what is meant by "overpay" and the use of the word "change".

If the expected behavior for users of LN is to esclusively pay in what os the cash equivalent of large denominated bills, i.e a 100$ note for a 75$ purchase, and exact change held by a consumers somehow makes the system less efficient, we are in for a bad time.

You are misunderatanding.

The expected behavior for LN users is to use LN; the proposed case is for hybrid customers choosing to pay onchain, replenishing their LN wallet with the change, and adding inbound liquidity to the merchant

I understand, thought the initial purchase was in LN too.