I'm buying less from Amazon due to flood of garbage they allow.

In some cases, there are hundreds of junk items before finding something acceptable. This is complacently allowed Amazon, in several ways: 1. they don't calculate shipping costs in price sorting (allowing dishonest sellers to sell 0.01$ items, with high shipment prices), 2. they hide where the item comes from, 3. they don't police items which should be grouped together (I think I once saw an item replicated more than a thousand times).

This makes the buying experience really tedious, and I don't think I'm the only one who thinks this is a problem.

But of course, while this affects Amazon adversely, I think it's a stretch to qualify it as "the downfall".