You're quite correct, of course.
I meant that season ticket holders will not be having to hand over cold hard cash at that time to attend the other 3 games.
Au contraire. My guess is the number of people who pay game by game is actually quite low so simple supply/demand theory suggests that if the Hull game is priced attractively it will draw in more punters than the league games.
Season ticket holders get the other three games for free so, again...