I, personally, would also appreciate some kind of differentation between people earning DM the hard way (butt-in-seat) versus premium travellers. You pay something extra and expect something extra. I do respect the Econ-DM as we have called them here but believe they should be happy with their First Class check-in, extra luggage allowance, higher priority on Op-Ups etc. I don`t see the need for them to have access to F-lounge for instance. Reserve this for people who do spend more $ with you.

EDIT: I did earn my first DM the hard way by the way.