Why? If I go to a hardware store and see a new power tool on the shelves that looks sturdy and costs less than the existing ones, why would I not buy it, or at least look for reviews on it?

Edit: this would be especially true in the longer term, as consumers start forgetting the marketing and there are no more "premium brands". In the near term after a ban, the older advertising still holds some sway, which of course creates a disadvantage for new brands. Still, a small price to pay for making the market more rational.