This is really it as far as Primal goes. Your average 10 year old in an arcade saw the machine and went "oh cool dinosaurs...holy shit the dinosaur farted!" and proceeded to pump a bunch of quarters into the machine. The slightly older crowd got the draw in with "hey i remember liking dinosaurs a few years ago, oh wait, did that just eat one of the people?". It was the perfect draw for a handful of quarters out of a certain market segment. Probably a decent short term earner, but once people played it a few times, most fell out of love very, very quickly.