Ultimate value in a dealer should be easy to establish if it is a true "apples to apples" comparison regarding brands. For instance, if I KNOW I need to buy a Roland XC-540 printer then it is a pretty straight forward decision regarding a handful of Roland dealers based on price, customer feedback and reputation. I already KNOW the Roland is what I need to buy - so the rest is just deciding who I am most comfortable giving my business to and who I believe will be there when I really need them.
However, my experience is that the final decision for an expensive piece of equipment is more complex than that with MANY more variables to consider. Instead of KNOWING I need a Roland XC-540 what if my decision is based upon finding the best "overall value" in a 48-64" printer? You have to consider brand reputation, print quality, print speed, ink costs/types, RIP compatibility, material size/handling, etc. Only after I can establish what MACHINE/BRAND is best for MY NEEDS do I worry about the dealer.
So instead of a Roland, if I decide a Mimaki JV33 is the best machine for my needs and you don't carry Mimaki - then your price/service/technical support/shipping matters not.