Some game collectors are motivated by the idea of owning something that no one else has. For decades, there were no preserved, shares versions of Marble Madness 2 available for that reason, but looks like that finally changed last year.[1] Akka Arrh was a similar case.

If a collector is interested in preserving and sharing, there's still the expense/effort factor. For an arcade game, they need to buy (or find someone with) specialized equipment, and may need to desolder chips from the board. I.e. there's a non-zero chance of destroying a one-off artifact, even when performed by people with experience.

The production ROMs for Discs of Tron have been preserved for quite awhile.[2]

However, if this was a test machine, it would be neat for someone with the necessary gear to dump it and see if the code is different.

[1] https://arstechnica.com/gaming/2022/05/after-30-years-the-wo...

[2] e.g. http://adb.arcadeitalia.net/dettaglio_mame.php?game_name=dot...