So, after doing all my exploring on my new (first) MVS-2-25, I figured out that the counter behind the coin slot door thing (what's that door called, anyways?) is a coin counter. Mine was at 89,164. That means it's seen $22,291 in quarters.
Are/were arcade systems really that lucrative? That's one helluva return. Or is there some way to manually change the number, and whomever did so just decided to make it really, really high?