Thanks for the insights. Majority of the people playing Splinterlands have nowhere near as much buying power as you do, but I can tell you that in essence, all cards are "future-proof" because they are depreciating assets. I'm sure you wouldn't need me to tell you that you might not immediately make back your investment, but it will definitely appreciate over time (granted you stay with the game long enough). Good luck with the rest of your journey! Have a look at some of my older posts too, they might interest you!
Will definitely go back and read your older posts. I love reading old posts, especially those who seem high effort and are trying to study the game!