The rapid rate of price hikes is nothing more than a rush of well off people competing and/or speculating, if it’s even fair to call it speculation at this point. The articles are a combination of sellers and the companies involved reaching out to promote everything, which is mutually beneficial. That’s normal and smart business practice. Rarity is also a somewhat relative term, because when you have a population of 10 sealed SMB, for example, sitting on Ebay, which has taken years to accrue, and all of a sudden 20 new serious buyers come in, availability changes incredibly quickly.
This happens in pretty much every hobby as it makes the turn into “collectible.” These discussions similarly happen across hobby communities, most recently MtG and comics. And sneakers, as Jone pointed out.
I’m not even quite sure what the theory is here. If the accusation is the auction houses are inflating prices, how are they making money? In that case they are paying way above market. The only way is to get legit buyers to come in and pay high prices. Otherwise, nobody is profiting, and the model will quickly collapse.