This is mostly to the devs of this (should I say) awesome game.
A pure online experience with no players online, apart from community driven events. How do you expect to sell copies anyhow with no-one online?
From that, I guess, you're counting on the random guy, and some sales, to buy your game. Well, it's clearly not enough, given this amount of time.
The game itself is great, just takes some time to be proficient.
So, why not make it free to play off steam itself, with steam promoting it for free.... then, you can upscale a sale from those wanting *more* perks -- and avoid a catch 22 situation with people NOT buying your game because there's no-one online.
P.S. your free website client, which only serve as hardcore word by mouth anyhow, is not enough...