Since there wasn't a game played, people should demand their money back.
So I can sabotage my oponents income, with not fielding a team in an away game. No game no income from his arena:)
I still think they should force a lineup of atleast 5 players, if the team roster has that many players. Walkovers should only occure against teams with less than 5 players. Obviously a team forcing a walkover game, should not receive any income from the week that walkover occures (fines issued next economy update for merc, tv, arena income).