I think there is a League rule.....there certainly used to be....that visiting fans cannot be charged any more than non season ticket home fans. For the same level of seating that is. I think we stick to that principle.
If we are asked to pay £30 for a seat at Tynecastle then so should non Season Ticket Hearts fans. Whether Doncaster and his pals enforce that rule when it involves the Old Firm (and others maybe) is another matter.
And of course if you can fill your ground with your own season ticket holders, then the impact of that rule does not really affect home fans.