America is huge and you might have to drive very far to get that second hand item. Also not everyone has a pickup truck to go get bulky heavy furniture you can’t take apart to easily transport to your place. And bedbugs are an issue in some places, especially major cities. It’s possible for some but not everyone.
I agree mostly, but that adds to the cost and it means taking time out of your day to go get the truck, go get the furniture, drop furniture off at your place, then take the truck back. It’s an added inconvenience most people don’t want to deal with.