They still turn up from time to time, judging by the ones I've seen over the last few years there isn't much demand. From what I remember the 50" version is a generic cab that was very common in the early 90s. Some arcades had one of those cabs for each new fighting game and they'd charge .75-$1 per play.
There was one around here back then. Pedestal, then a gap between the pedestal and monitor. There were chains on either side of the pedestal connecting to the sides of the monitor box to keep people from walking in front of the screen.