The first machine I ever had, which was a mame arcade, was a 4 player. We did have some good 4 player beat em ups going on at Whiskey back in the day. The trouble with those is making sure there is room for 4 players to get around the machine is going to take up a lot of real estate in our tiny arcade.
Also Simpsons is in the SF2 machine. The menu screen doesn't make a lot of sense so it takes a while to find things. Hopefully will make some improvements on that machine someday.
Official Dumb Records #1 Hi Score Holder on Time Pilot, Blackout Pinball, Raphael champion, Fish Tales Pinball