I'm one of the many immigrants from bay12 and found the whole RP idea intriguing. They're pretty much sticking to Dwylight as the realm to link into for new players. In some senses this may be either a good thing or poor, too much heavy RP may turn off the more casual or strategy based section of some audiences (I actually like the SMA RP part).
As another idea, it might be worth mentioning the mobile site for Battlemasters. I don't know if it's in heavy use yet (or even if the devs want much traffic going through it), but it works, it's fast and it's an ideal platform for pseudo-turn-based (but sort of RT) style games like this one. It's quite handy to be able to do a turn on your lunch break or just before bed. I use it on my Nokia E63, which has next to no memory or processing power compared to modern touchscreen phones, so most platforms with a reasonable browser should work fine (I'm using Opera and my phone to type this post). It doesn't seem particularly data heavy at all, so costs are pretty low for players, free on wifi.
It might draw in more players, and it also gives current players a good chance to always get the messages/orders they need to function within a realm more easily. It only really takes 10 mins to do a basic turn in BM, it's typing the RP posts back to people that takes the time.
Anyway, I don't know if it would help uptake of new players but it might. We live in a very technological world. The devs posted it on bay12, so I guess anyone is free to use it. The mobile site is:
m.battlemaster.org/login.phpGive it a try if you haven't.
Ps, I've never heard of anyone getting a ban on bay12 for posting about a game unless it was to do with porn or they were bots (or just trolling very badly and consistently). The "Other Games" bit is for precisely that, and is how I ended up here. The stuff you do get away with on B12 is pretty wide in scope, so I don't know how you managed it really