rent a game server and run text ad to promot your hosting service during begining of the game and while waiting to spawn. also let your customers have some private slot to play.

doable?

It is through some games. Some games you can have a timer ad. They are usually plugins.

Doable, if your market is gamers.

If your market is local business professionals whose idea of a game involves a little white ball and a set of clubs, it probably wont work.