I know this has been mentioned before, but why not have books of five or ten match tickets that you could use for any game?
Advantages:
1. People who couldn't afford a full ticket could still feel like they were making a commitment to the club
2. Extra cash up front for the club
3. No need to worry about the installment plans, just buy one of these when you can afford it
4. If we do better than expected, people who jump on the bandwagon would be able to boost the club funds by buying one
5. Most important, people who can't get to all the games and find a full season ticket uneconomic would then buy one
(I know there are some out there who would still buy a full one but lots of us can't afford it)
Just a thought.