[w0m]

> Normally an old, used CPU for a dead platform will go for a small fraction the MSRP.

True in general- used CPUs from discontinued platforms sell for a small fraction of the original MSRP.

Buuuut, the final flagship part on nearly every platform is an exception to this rule. They are generally sought after as the definitive 'End Game Upgrade' because they provide users with the simplest, most cost-effective performance boost—a single component swap—bypassing the need for a costly migration to a successor platform (which requires new RAM and a new motherboard).

It tends to happen every generation swap, 5800X3D is just the latest.