The issue with estate sales is that they are usually estate disposals. People inheriting their parents’ stuff are usually themselves grown adults with their own busy lives, and the average estate consists of immense amounts of clutter that the inheritor has approximately zero interest in. They’re grieving, they’re seeking closure. Not looking to spend years sifting through hundreds of thousands of items of household bric-à-brac looking to extract value. They want your house cleared so they can sell it and hopefully pay off a bit of their own mortgage.