Can't see your predicament I am afraid.
Pay on the day £20
Cost per match if up to 4,499 season tickets sold £13 and a bit
Cost per match if 4,500 or more season tickets sold £10 and a bit
Get a season ticket - you will thank yourself in the future when you can guarantee a ticket for the Play-Off Semi Finals before the wasters who decided not to get a season ticket
Also, I always get one, so that no matter what happens financially during the season I "might as well go darling, afterall, it is already paid for"
Go on. You know it makes sense.