Well I guess being a fan is a bit like being a LibDem pre 2010 - it didn't really matter what you thought/said because there was no chance of you ever having being accountable for it.
Firstly, directors of the companies (clubs) are fiduciaries to that company. That means you have to do the best for that company, which generally means financially. So, without knowing the details of e.g. the TV deal with and without Rangers, if in fact the deal 'with' is worth a lot more, it would actually be very hard, legally, for the directors to turn that down. The fact that the SPL rules seem to leave it up to their discretion (again without actually having read them) actually puts the directors in a very difficult position e.g. open to personal lawsuits if they didn't accept the best deal on the table for their club.
Secondly, don't forget that directors are personally liable for a company's debts if they continue trading whilst they knew or ought to have known the company was insolvent. So if the 'loss' of the supposed income from Rangers being in the SPL tips a club from having a balanced budget (or within what third parties have agreed to stump up) that again leaves them open personally. I'm guessing not too many people here would be prepared to (e.g.) lose their own house in pursuit of a principle.