I found a place similar to this not that long ago although it was a permanent fixture in a tourist part of a city. I think the idea of going to it was actually a lot better than the actual experience. The one I went to was slightly different in that the owner had a collection of oddities which were focused on serial killers such as letters from John Wayne Gacy and stuff like that.
Just like your experience, once you have been in these places for an hour you are basically done and there isn't really much reason to return.