I see the point you are trying to make about honest business, but as an example everywhere on this and other forums it is almost universally recommended to change water pump, idlers, etc. when a timing belt is changed since all the "work" has been done to get to that point. Is this not the same thing? A similar thing happened to me on my Ford Expedition (150,00 miles). I had leaking rear wheel seals and asked them to replace the bearings too since they where right there. Another $50 to a $400 dollar job. Went to pick up the vehicle and they "inspected" them and didn't replace. So now if they fail I'm out another $450 dollars instead of the $50. Plus I specifically said "replace" not "inspect". It was even written on the service order. The mechanic should have advised but the decision is up to the owner.