I'd still like to be able to purchase the boxes in a bundle. say 5-10 silver boxes as a bundle, but you get 1 or more Epic cards. Gold boxes get Legendary cards.
Epic and Rares come up far too little.
I totally forgot to make this point and thanks @RazinFrost for bringing it up. Would be awesome if we can buy ALL boxes in bundles. Like in the real world, wholesaling is you pay less to get more but you have to buy in bulk. So maybe 10 silver boxes could cost 120k cash and it would all open at once instead of 10 individual opening animations OR it can cost 150k cash but have better drop percentages for its contents. Same concept can apply to Gold boxes if the devs deem it appropriate. I also agree higher end cards are harder to get especially as a F2P player.
Another thing, the paper box cooldown time is too long imo. Maybe shorten it to 4-6 hrs instead of 8? Also, I wouldn't mind spending in-game cash buying paper boxes in bundles if the upgrade card feature is implemented.