I would tell the client if all you are going to do is print a small color logo on letterhead. Then tiered billing is the way to go. Anything else would mean that you are relying on the software to interpret the coverage and which tier that coverage falls into. Thus, with tiered color you could never have a predictable expense. We can give you that with our "all in" color billing model. You pay one price for color not matter what the coverage is.