Daniel Guimarães on 2. Jul. 2017.
I don't agree it's safe to state "removing duplicates means they'll sell less lootboxes". I didn't buy lootboxes in the Anniversary event exactly because I was frustrated with duplicates I got in the Uprising event (I got 2 orange uprising Torb skins, and I saw a video of a girl opening 100 of them, I think, and she got like 4-5 of that same skin).
So knowing you will get better rewards from them, is also an incentive to go and get them. You'll need less lootboxes to obtain what you want, that's true, but that means whenever you do buy them, you'll get something better for your money. If one evens the other out, or which way the sales of lootboxes will be nudged to, that's something I don't think even Blizzard can entirely predict.