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Aha. You have to drag the slab to the small tab where it says "Sell" and not the basket. I knew I was missing something. I would definitely turn that entire zone into a sell region just to make that interaction easier to find. 

If levelling up packs does change the drop rate, maybe there's a bug that prevents the game from showing that to the player? Here's a couple pics from when you mouse over the packs of different levels, and they show identical drop rates. 
 

Thanks for taking the time to respond, and best of luck going forward!

I feel like I'm massively missing something here.

Aside from unlocking packs, does gaining XP do anything? You never mention anywhere, if so. And if it only unlocks packs, what's the point of levelling beyond 3? What's the point of the bonus XP granted from the collection if XP serves no visible purpose?

I wasn't able to find any way to interact with a card after slabbing it. What's the point of increasing its sell value if you can't sell it? If there is some way unlocked later on down the line, why do you tutorialize a feature which is (apparently) worthless in the meanwhile?

It feels like the ROI on later packs just gets worse and worse and the consistent money is just opening boxes of the first pack, which seems silly? Nothing less encouraging than getting a new tier of pack, spending hundreds of dollars, and making $20 back.

Again, I feel like I'm just missing something here, but with my above issues, the game is adorable and interesting but it feels more like an idea than an actual game. Maybe you could spell out these systems a little more clearly for those as dense as myself?