I've got 4 teams (2 trad & 2 RT) and when all are on the road, it takes too much time to prepare already since there is really only 1 night to set up for away games (for RT at least). When all the teams are at home, it's great as you have several days to play all the games.

I might get an itch and take on 1 or 2 more teams if there were no extra charge, but I doubt it.