By your logic a boxed Apple Lisa or to go further back a mint Altair are far, far better computers than the Amiga.
(Hint: it has nothing - zero - to do with what the real world will pay for Amiga-one systems from the year 2000. People from "outside" aren't flocking in and driving up the prices of A1 gear, it's all churn from about 1500 users and nothing more. Hype and Amiga Inc set the price and Amigoids are struggling to recoup their losses investment, and they sell to other Amigoids. Take a box of SAM boards to your local computer sale/show, and I promise you ain't gonna sell out of 'em.)
You can't deny though that my AmigaOne from 2005 or whatever is a million times more useful with current software for its OS than a PC from the same era.
I didn't say which was better, just that a PC will get obsolete a lot faster.
And of course if you go to a local computer show, you won't sell out fast.... but the world is a lot bigger than that. If you go to the open market like eBay, you WILL sell out at far higher prices than a PC would command.
However you cut it, you can't deny that the value of a 6 year old Amiga is worth more than a 6-year old PC - whatever the reason. Equally a $25K PC will be worth less in 5 years time than a $2K Amiga.