Now I can see both my silver eagles spot up at the same time!!!! (That's a ding against silver eagles, not the holder)
I could see wanting a business strike and proof of the same coin slabbed together. Maybe. But this holder and its limitations are not of any interest to me. Now if they had an option where you could have a completely custom slab for encapsulating a mint set together. I'd be all on board with that, even if there was a hefty premium.