I made the decision a couple of years ago that i would only do vending for charity events, it really is too much of a gamble to try and make a living from it.
Other than the charity events I have a few corporate deals that happen year on year and have been dabbling with the idea of expanding that side but to be honest have too many commitments which is why i asked on another thread whos currently vending and would be interested in any leads i get (geographically). I have an automated quote system that will be going online in the next week or so. The menu covers pretty much everything.