The odd midweek game is ok with some notice but would prefer not to play midweek every week. Not always simple to get out to say Island Bay or Petone with ample time for changing and warmup before a 6pm kickoff on a weekday if you work in town. Also 8.15pm in Petone (we had one of these this season) is a fairly late kickoff for a 90 minute game on a weeknight if you've also got a half hour drive home after that.
Ideal is probably something like 6.45 or 7 so most people should be able to get there without too much of a rush, and you won't be getting home and having dinner at 10.30. But I do understand that in order to get 2 games in before the lights go off 1 has to start pretty early.