I simply do not understand Modern - Doncic vs Mantle

[Delray Vintage]

In the context of today’s stock market tech valuations, NFT’s, crypto, I understand how Donic and the like sell for astronomical valuations. Ruth will always be valuable and most of these modern created rarities will collapse. To the modern collectors these cards are worth it, but having seen numerous bubbles in my 67 years this sure looks like one. Print a rookie card, paste a piece of a uniform and an autograph and suddenly it is a million dollar card? I am sure there are people out there who can justify it as the new way of collecting. To me it spells B-U-B-B-L-E.