True. I just cant fathom that much currency for a piece of cardboard paper. But I suppose there's no difference in investing in something as long as its worthwhile. Its almost like investing in an art piece. If having a couple expensive cards helps your portfolio it seems like a good idea. But, just like any investment, you have to spend money to make money. To me, cards are just too much of a risk to take a chance on spending that much money. Right now the market for cards is in pretty high demand, but it ebbs and flows so much that you could be stuck with a losing hand. I'd rather just collect 'em, flip some to get better ones, flip the better ones for one or two good ones, flip those when the time is right for another couple.
For example, maybe start out with a couple 9-10 PSA grade rookies like Shohei Ohtani, Wander Franco, Aaron Judge or Mike Trout.
Wait until the market for these cards is in higher demand. I expect Shohei's will right around the trade deadline if the Angels are looking to move him.
Right around MLB postseason-NFL pre- season flip my MLB cards for NFL cards. Collect popular NFL players, not necessarily rookies, so your Mahomes, Burrows, some vintage. Keep flipping those throughout the season.
Basketball cards are also pretty hot, so collecting those in the off season might also be a good long run investment to get the card I want.
Eventually flipping the cards might be my best option to obtain a card I really want. Kind of like flipping cars. But for me, the collecting is one of the more fun parts.