EVE Online teaches you, it's that you've got to put a lot of thought into where your money is going. (If there's a second thing, it's that people are awful. Third thing is that you can take a nap during space battles.) Perhaps you've taken that lesson to heart and decided not to spend money on the game, but Steam is once again tempting everyone by selling the game at a mere $5 today.
Not enough? You can also purchase a subscription plan at a discount in addition to the game, saving yourself money and getting in on the dynamic action of tabulating spreadsheets. The deal will be active today and tomorrow, so feel free to give it some thought, but make your decision soon before the discount is gone forever. (Or at least until the next summer sale.)