Besides the financial obvious?
I love the complexity, the min-maxing, the multi-path way to "win", and the 'snowball effect' (i.e., compounding).
You did say *besides the obvious* \- so I don't want to sound too blase, but I always loved playing what lots of people jokingly call "spreadsheet games".
I.e., I've bought/played every edition of Out of the Park Baseball (an MLB team management sim) that gets deep into the weeds of org management (payrolls, scouting, ticket prices, roster management, et al) and getting to the point where I could literally build a juggernaut that would win 120 games a year. Ditto a lot of the complicated world builder titles from the Paradox game studio (Europa Universalis, Hearts of Iron/WW2, Victoria, Stellaris, etc).
I *loved* finding all the nooks and crannies to "min-max" -- getting to the point of winning at the highest difficulty levels by finding *just the right* seams to exploit and hit the 'snowball' effect.
Of course - real money, not a game! Now 7-8 years in (not counting the prior \~15-20 years of standard 401k/IRA saving/investment)? I make sure to continually measure and reassess -- basically, "If I can't beat the S&P? I've just got an expensive hobby and I should buy a Railroad Tycoon type trading game".
So far, so good! But my love of "spreadsheet games" has served me well: Swim the complexity. Continually learn what works for me and what doesn't. Always measure and reassess based on results.