The article claims "Second-hand prices for the 5800X3D average around $500-$600 on eBay. Some of the highest-selling units sold at nearly $800, showing how desperate some buyers are to buy AMD's best gaming chip that still uses DDR4 memory"

This is absurd. "Average quoted" on ebay does not mean anything, neither dors their claim of "highest selling" which is "highest listed". Nobody is buying at these prices.

People buy the lowest priced (incl. Shipping) with modifiers for professional>private, seller review rating, location and picture/description quality.