I went to GhostBar (Palms) in Vegas months ago and they have the same thing. A LOT of people were at the entrance before they enter the ledge which shows you the phobia for heights is common. Only 10 persons were at the ledge drinking heavily. My guess is that 5 were acting cool and needed the liquor to give em some courage..
I can’t do the Ghost Bar, either. I prefer my bars to be close to the ground (doesn’t hurt as much when I fall down and pass out :-) )