Recording that would be a time-consuming and expensive, and when you look at return of equity, what exactly would the club benefit from it? They'll sell out either way. They're already taking steps to reward their ST holders (I'm not one, I'll stress; I'm missing out on the final.), but the rewards of undertaking a tracking system are practically non-existent compared to the effort involved.
Plus, how elitist does this look to the casual observer? "I wanted to give hockey a go, but apparently I'm not a big enough fan to buy a ticket." How will the sport grow if you start alienating newcomers? And even those long standing fans , who love and support the club but either live too distant to regularly attend or can't afford to go to many games, would be snubbed out by the system. It's not something that's done by any other sport, and there's a reason for that; it's a poor attitude to take.
Yes tickets are scarce; it's one of the biggest hockey events of the year in our own ground, there's naturally going to be a lot of people wanting tickets. But you have no more right to them than someone deciding to go to their first game.