Some have an appreciation for multi-player cards, especially when the featured players are highest quality and the player grouping makes sense. Team-specific “combo” cards are more popular, because unless all of the players featured are HOF players (or future picks) they can really fall flat.  Personally, I find it exciting to pull a card with two players side-by-side, but I find it even more fun to spot a ‘hidden’ big-name player somewhere else on the card in the background. 

But the biggest challenge with multi-player cards is if the card features even just one rookie, then the chances of the card decreasing in value becomes much greater. For instance, around 2006 there was a Topps Triple Threads card that featured both Larry Bird and all-hype rookie Adam Morrison. The lazy comparison of Adam Morrison to Larry Bird aside, that card was going for top dollar. But as Adam kept playing, it became more apparent that he wasn't going to cut it in the NBA and that card just plummeted, to the point where having Adam Morrison detracts from the value if it was just Bird. In a modern world, you have NBA Hoops that pair Steph Curry when someone like Keyonte George or Amen Thompson. There is no connection between these players, and ultimately, if those young rookies don’t work out, they will eventually detract value than if it was just a Curry card cooking alone.