Given the official figure of £7.9 million accrued in 2016/17: we can possibly assume ticket sales of maximum £21 million for the previous 3 yrs.
Therefore ticket sales = £29 million = 70% of overall revenue.
The other 30% = approximately £12 million. Not much when you think there was Maguire & Walker money???
Certainly doesn't point to a massive amount being contributed by McCabe/prince.
I'm sure someone will say i haven't a clue & that i'm thick but .. that's my take.