That's very public-spirited of you, but as evidenced by the numbers of empty seats each game, there are possibly hundreds, maybe more, of "casual" ST holders who, unlike you, don't have any kind of social conscience, and are quite happy to waste the ticket, without reflecting that there are loads of fans who would love to see a live game.
This was particularly acute during the PL years when there were acres of empty seats for the less glamourous games.
Nobody is blaming ST holders for the inadequate capacity of the ground - of course not ! But ideally there should be a way of identifying the regular no-shows, and encouraging them to share what they do not want for themselves. Might be a waste of time, who knows ? Maybe they just couldn't care less about anyone else.