I don’t disagree with you that serious money can be saved if one knows the correct way to buy from a private party. But psychological comfort also has real valu

I don’t disagree with you that serious money can be saved if one knows the correct way to buy from a private party. But psychological comfort also has real value for a lot of, maybe even most, people. It may seem like a poor reason to you, but for them it’s worth it. Plus, you should be happy to have fewer people competing with you to buy from private sellers, thereby further lowering your price.