I hate the whole idea of this. If they track you around, maybe realize you order from fancy places on uber eats, then they will raise prices on something that costs them the same. There's something that strikes me as especially awful about automating the "how much is this individual willing to pay." It's like the worst parts of searching for air fare.
Yet another reason to advocate for privacy, so they can't just buy records about you to determine your price sensitivity from the rest of your life.
If everything everyone bought had perfect information on what they're willing to pay, I wonder what markets would look like. Would getting a raise immediately cancel itself out?