Would I buy clothes from Amazon? No, I like to try them on first. Returning stuff by mail is a pain.
Would I buy expensive home furnishings from Amazon? No, I like to see, touch, try these things before I spend a lot of money.
Would I buy perishable groceries from Amazon? No, because deliveries happen when I'm at work and I don't want perishable food sitting in the sun for three hours on my front porch.
Do I buy toilet paper from Amazon? No, because it's easier to pick it up at the store when I'm there for something else anyway, than to get it delivered and then have to deal with disposing of the cardboard box it came in.
And with anything Amazon, I'm worried about counterfeit goods.
So what do I buy from Amazon? Inexpensive, low risk, low margin goods, and the occasional book.