I've been saying that these packs will be a waste of money because they'll never come close to being worth $1, but I apparently don't pay enough attention to the price of Rebellion common and rare singles. There are plenty of them worth $.25 or more. I have Chaos Legion pricing lodged in my old man brain. If Concubine Armadillo has common summoners, a "jackpot" one of these packs could be one with several summoners.
5 cards for $1 still seems like the better approach. If someone wants to spend $5, they can still easily do that. But if someone just wants to try their luck with a single $1 pack, why stop them? Every little bit helps.