Our annual agreements look completely different to a customer than they usually do to us. They don't usually want to get ""free stuff"". what they most often want is to insulate themselves from what they consider as BS forced on them by troublesome ""systems."" So, they don't object to paying extra for things under their control (new workstation installs).
We must remember that our ""costs"" associated with annual agreements are truly opportunity costs, and not some hourly ""cost"". So, insurance thinking is good: we will spend more time on some agreement customers than others -- much like the buffet.
Also remember that several studies have now shown that wine tasting is heavily influenced by the wine's price. While there is a limit, if you charge a higher price for a deliverable (not an hourly rate), your product will be seen as more valuable & better