Er,because without rules there would be chaos? Because companies, and jobsworths, love to refer to Terms and Conditions and the small print? And, yes, we all hope to bend the rules sometimes and, yes, we all hope that common sense will also prevail. Mostly I hope at the Albion it does.
And...
Regarding this paying the difference to upgrade the ticket - is that to the price of an adult season ticket holder or an adult single ticket price (big difference)?