I don't buy Szabo's "annoying" argument, but I do buy Knut's "that's fiat" argument. I don't wanna speak for him but as I roughly recall, he thinks it's much more likely you just pay a normal amount for x-many usages you redeem at your leisure. at the same time it's a bit arrogant to say you know how people will use something that has only just been invented or only just become possible so, sure, maybe they take off massively. but by base case is Knut's.