OK, yea its possible to get hacked, but if by hacked you mean find out where you live, they need your IP and a nifty little piece of software called NeoTRACE (wont go into detail)
MOH, I dont think that can be done in DB, too high detail and such. Dont start so high. Try online pong!
Id suggest just setting up a server with Gamespy or ASI, because its very hard for people to hack, and they wouldnt waste their time hacking a small group of people with online pong, trust me. Just set up a fairly decent firewall (or two, or three or.....) and you should be fine. I dont think anyone will come looking for a small dark basic group through gamespy sorry there buddy
RPGamer