I have learned through my 2-3 years as DM so far that I should not expect anything more just because of DM - except if it's some official/published benefits, and for the priority in getting to talk to someone on the service hotline.

in general, I don't feel from the interactions they show that they value DM too much more or make me feel that my business is valued - and frankly (I think) I'm not even a "low value" DM already...