Recently, I found two games in the wild (A BSD [$.50 a play] and a JP [$.25 a play]). I played the BSD first and then went over to the JP and realized there was one credit on the game still. I gladly played considering that the place was empty. I figured a credit was left on the game because somebody assumed that the JP cost the same to play as the BSD.
On a different day, I went back to the same location and put a quarter in JP to play and it took roughly 3 min for the game to actually start because of a ball search(One Ball Missing).[There is a ball stuck between habitrail and a pop bumper.] It makes more sense now why a player would walk away.