When I run a game, it usually goes like this: First session has three players. I mention that I've started running a game to someone else, so a couple more join in. Sooner or later, one of the players' adolescent kid wants to play, which means my younger adolescent wants to play, and the whole thing balloons into like 7 or 8 players, with some of them not even trying to pay attention. Then the whole thing kinda collapses and I'm down to 3 or 4 players again.
Obviously my first trouble is group management, but let's ignore that. The group's Obligation is based on the number of characters, to ensure that smaller groups have it come up on occasion, and that larger groups aren't getting hit every session. When the number of players changes, I somehow doubt that we're supposed to recalculate starting obligation every time. Anyone else know how they'll be dealing with this? I can't be the only one with a fluctuating group.