My Nephew and brother is playing on this Bitcoin server - there is definitely a large opportunity there. It is growing really fast, but it is still early stages. I am not 100% clear on who holds all the BTC though, it is probably just a centralized mechanism at this point.
I told my brother to contact them, but a sponsorship by BitShares Play/BTS would be the tactical move at this point I think. We could also create a large BitShares // bitUSD logo inside the game.