If Amazon had a "Prime Plus" or something that would allow me to find and order non-third-party-seller, accurately described, quality products with a robust no bullshit "whatever the cost, will go above and beyond fixing any problems in the rare event they occur" attitude, I'd be very interested.

I also wouldn't mind a marketplace that is well known to be hit or miss. When I place an order on alibaba or bangood, I know exactly the risks I'm taking. That risk, weirdly, almost makes it entertaining. "Is it going to be the ball bearings I ordered, or a pair of Crocs shoe knockoffs, or a beef jerky? Place your bets!"