There's a fair number of low game count systems where people are really enamored with one game. For example, I'm a big fan of T-Mek (I've got a machine with issues in my barn), but that system only has two games, so it waits for someone who is interested, determined, equipped, and skilled to figure out the protection to enable it to run properly in MAME.

Habbo Origins wouldn't be around if it wasn't for tinkerers who figured out how to make an already compiled Habbo DCR run as a stand-alone desktop app, over a decade later. Which prompted a Sulake Employee to try it out. Said employee was originally part of the Habbo Retro / Emulator scene. ;)

The Reverse Engineering scene is quite a scene.

Some arcade hardware is totally custom and only runs one game. Some chips are unique and only appear on one board. MAME's mission is clear, however SNK is a big enough name, along with Samurai Shodown and Fatal Fury, that the HNG64 was always going to get attention.

I think the word you are looking for is passionate.

Archiving the past is a noble endeavor.

Gotta catch ‘em all