I'm not sure I get your point.
I just bought a SpiderMan #1 reprint for $4, lol. Pretty sure these reprints aren't going to impact the price of the originals - could even pump them maybe by creating more awareness.
All goods are priced according to both objective and subjective terms like production costs, supply/demand, utility, scarcity, social perception etc: Broccoli, houses, socks, stocks, Ferraris, etc.
The communities of interested buyers for each item *always* mostly determines (agrees to pay or not) the going prices (except where external forces like luxury taxes and tariffs exist).
In this example at hand of a niche collectable of a quasi-art piece for a trading card game, I agree that to me, who does not come from wealth, it's a bit nonsensical.
Some rich people just want "the best" or "rarest" of something whether for ego or enjoyment etc. And I don't see the issue with this. Letting people freely bid on and determine the price seems more fair doesn't it, than say some centralized control arm?
IMO let the art snd collectibles market dictate themselves.