I'm thoroughly enjoying the sever. I have a 6 box crew that I'm slowly working through old world content. I plan on stopping, grinding out perhaps some sol ro armor, epics, etc, before doing the content in order, expansion to expansion. It's a blast and because of the changes I still need to spend time to move, but it's not horribly painful and I feel like I can accomplish quite a bit in even 30 minutes of play time.
That said, I feel like a lot of people would actually really enjoy the server even without boxing, or only boxing a duo. It's very approachable, and feels a lot more authentic (albeit it faster), because there's no straight up custom content (minus the charm).
Anyways, not sure how to market to them, but I imagine there would be a lot who like it boxing aside. I'd have a blast playing a single toon if I had a few buddies doing the same, for example.