I'm just going to post some thoughts here, but keep in mind that I've only known this game for two years. Some of you that have been around longer (or that can't make sense of what I'm saying) might just completely denounce this as dumb, but I'm just making stuff up as I type.
I think the main reason that Brikwars isn't really well-known is because of one simple fact: it's completely web-based, with no officially released rulebook. One way for a game to get a good start is to sit on a shelf in a store so that it can be noticed by people browsing through. Now, I'm not saying Mike should get the rulebook published and make it into a profitable product, because 1) he'd have a hard time selling a rulebook with no eye-catching merchandise like cards or minis to go with it, and 2) I think he just wants to offer people a new way to play with their toys. All I'm saying is that it's hard to get a solid following on something that's just hidden away somewhere on the internet.
I also think we see such little interaction between members because many people seem to sign up because they happened to stumble upon the site. Most of the members seem to be
in terms of players in their area, which means that they don't really spread the word. If every active member got one of their friends to sign up and start playing, we'd see more than double the members. We'd see a huge increase of battle reports simply because they could play against each other. There's be less time spent organizing battles, and more "hey, wanna come over and Brikwar?"
That being said, I also think Brikwars has huge potential for growth. Lots of people play stuff like Warhammer, as you would find out if you went to a convention (I've been to Games Day twice, and it's a pretty serious fanbase). But one thing that I see a lot in former wargamers is that it took up too much of their time, or that it was too expensive. This is where Brikwars comes in. A wargame that you can take as seriously as you want, and can be played using your old toy collection in your basement? It's like the ideal wargame for college/university students. It can cost almost nothing to play, and doesn't demand the same dedication that comes from painted miniature games.
We could totally get more people into this game. All it takes it spreading the word. If you're hanging out with a friend and don't have anything else to do, just say "Hey, I know a game we can play!"