Don't know what the term "sunk-cost fallacy" means? This article explains it nicely.
Why is that? Straight up, it's sunk-cost fallacy, and I should lay my cards on the table at this point -- I'm in the throes of that fallacy right now. I dropped £80 on the special edition of Anthem -- dress up a clever fantasy concept in sci-fi trappings and a loot compulsion cycle and you'll take me for my last penny every time -- and stopped playing it after a few days.