The only options that come to mind are banner advertising on users websites or faucets, and of course a signature campaign. Only problem with a signature campaign is it will generally cost you that 200$ in btc easy and wont get a ton of users wearing the sig at that price.
I'm surprised no one on here has anything gaming related specifically.
I run a gaming network with decent traffic. The only downside is it's focused primarily on RPGs (and MMOs) and I'm not 100% sure how well that'd translate to Minecraft users... if you're interested, though, toss me a PM and I'll see if we can work something out.