I think the arcade version - and perhaps an arcade replica, via arcade/multi-sync monitor and avga using Mame - is easier than running mame with hwstretch. I think the best I did on the latter, a couple/few years ago, was 711 grand. I think in an arcade, recently, I got somewhere near 800, and a couple nights ago using switchres I got 800-somethin thousand.
On the occasional occasion I might have a beer and have a small buzz, I'll be relaxed just enough to do pretty well. Course, a couple nights ago, I was just relaxed, anyway. A kung fu moment.
You notice how many scores are set in the first two or three years of the game coming out? Maybe it's just not as many people are interested in this kind of thing? I know I wouldn't do a marathon like that - though I see nothing wrong in getting to some satisfactory point, saving the state, and continuing later.