That is always a highly flexible number.
It's not as though the club would ever be deceitful in not saying what a break-even figure would be, but because there are many factors to consider - the prime one in this instance being 'how much is a match ticket going to cost?' - any figures mentioned now would only ever be hypothetical, based on one set of circumstances; circumstances which could, and probably will change from time to time.
Of course your right it is a highly flexible number, but it is however a very critical number.
It will directly effect the credibility of any proposed forecasts, profitability and therefore the viabilty of the project.