You can back up the last one left at the end of Mission 3 to the edge of the platform and punch away like at the 30 minute section of the video, but that one seems stubborn about getting into position.
I can usually get the enemies to cooperate without much trouble. The Linda at the end of Mission 3 seems to be the most stubborn about getting into position.
I remember in that 521k video where the guy burned his extra lives in that section. I can usually make it past the blocks without getting hit, but I don't think I'd want to risk looping that area.
I haven't bet anything recently. Maybe I should get back into it while they're winning. I imagine that breaking 400k would take a borderline perfect run and I really don't have the patience for that.
I guess it depends if that was the only way to play it or not. I probably wouldn't pay over $100 if I was able to play it on an Everdrive or something. If a physical cart was the only way to play it, I'd probably go 2-3 times that.