I do the rares thing, I just acknowledge its not a valid reason to withhold art. Rares collecting not equivocal to a skillset/template.

Owning a server birth
anything isn't "history." A Seer item would be history. An EM item would be history. An engraved wedding invitation/ring would be history. An item some random person
swiped off the map due to shoddy coding =/= history. Nice try though.
Yes, let's demand they make new art
just to appease a tiny, tiny minority of players.
Again, hoarding art because a few collectors might get their knickers in a twist is bad decision making. Consider all the art we don't have access to because once upon a time they might have been a server birth and are now locked away collecting dust in someone's house.
We aren't talking about the UO equivalent of a Faberge egg, we're talking about
playing cards and the like.
The crystal skulls weren't "rares" by any stretch of the imagination. Nor were the trade-in Doom rewards...less common than say a Blackthorn arty, sure...but definitely not "ZOMG rarez!" Simply because some people
want them to be rare so they can charge a lot for them, doesn't actually make it so.