Who uses classes to escape? I mean, it's trivial to have a holy symbol of the appropriate alignment by this point. Or Dura, or a kid with the appropriate magic, or wings or demon legs.
Personally, I'd say Tycoon is the weakest class. There really isn't much use for money in Book 3, unless you need to change your alignment or you're worried about victory at Tornassa (which I normally have sewn up by then).