They dont really have that much of a choice theres around 20,000 club wembley seats so that brings it down to 70,000 capacity, then they have to give tickets to all the clubs that competeted in the competition, there will only be a few thousand actuall corporate tickets.
I presume the club will sell to st holders - hopefully stagger with the points to stop the system chrashing , and then to members on a loyalty points basis - if you are short of points get a ticket to wigan 5 points only £15