If the product quality doesn't match its price or it's used, just write an honest bad review. The seller will chase you by e-mail and give you back 50% or even 100% to edit the review. At that point you just temporarily edit it, get the gift card, and then edit the review back to the honest review.

And then you have yourself a good deal on a used product.

All we need is some AI to automate the above process and make a one-click interface to get discounted used stuff for 0%-50% of the price.

I personally don't think that's fair and more importantly it doesn't solve the problem. You will pay less, true, but you still get a used or poor object. At least to me, that's not appealing at all.

Surprisingly, I’ve actually seen that for many items in home improvement, Amazon is much higher quality than Home Depot. That may say more about Home Depot than Amazon.

Why haven't consumers stopped buying?

Who said they haven't?

Amazon's revenue.

Revenue is a laggard metric. Amazon's sideways share price should be more eye opening.