Which is only a portion of why I don't do that. Vertigo in the choir gallery is bad enough.
Our choir loft has a steep rake and the front row is pretty scary. The cantor stands in a little bumpout next to the organ console (which itself is in a little bumpout over the aisle). Fortunately I am not afraid of heights (low tight places give me the grues though) and I don't have a difficulty even standing out there in midair cantoring, but there are a couple of people who can't sing in the choir because they can't deal with the steep rake or the far too plain view of the hard stone floor waaaayyyy below. The organist has a rear-view mirror so he can see what's going on at the altar, but our man has a disconcerting way of leaning out over the rail to see when the entrance procession is starting. The rail is way too low -- obvious nobody consulted OSHA!