I share your concern about bogus private sellers, but many of your assumption are plain wrong.

Many thousands of genuine private sellers will be selling off large private collections, often individually. I have a huge private record collection, totally separate from my business. It numbers in the thousands. Likewise, I have over a thousand old magazines, football programmes and books, and thousands of CDs, none of which were ever bought with the intention of re-selling them. By your flawed reasoning, I would automatically become a business seller if I decided to sell them, by using my allowance on an eBay private account. That is utter balderdash.

Private sellers can legitimately be running unlimited listings, and selling an unlimited number of items per year, without being businesses, provided, of course, they can show that they were private possessions. (I do agree that a large number of transactions hints at a business, but doesn't necessarily prove it.)

Your diatribe about inherited items is also utter bilge, fabricated to try to reinforce your absolutely tenuous point.

Genuine private sellers, even at large volumes, are NOT the problem here. No sensible business seller has any objection to them. Your anger/disgust, should be directed at the businesses masquerading as private sellers, and at eBay for allowing (and pretty much encouraging) such behaviour.