If I'm going to plunk down anything more than a dollar(and i think that is extreme for some titles, but reasonable for the new stuff), then I better have a guaranteed ball time or length of play. I know a lot of places charge a dollar for Ghostbusters and while I love that game... I'd lose my shirt if I played it on location. I mean... A game of that for me, if they have no ball save timer can be around a minute...
And generally I do need about 3-4 plays on a game to get the feel for it... I personally wouldn't mind like 7 plays for 5 dollars. Or something like that. OR the 3 plays for 2. But, again need some guarantee about ball times.
And I think if pinball on location prices itself out of play... Then that's bad long for this hobby. This hobby needs youngblood. And not much of that going around.