Well I mean, you don't actually need to pay for it, you only need to "make them cost something." (You know, like a JPEG? Nobody really pays for these, do they?)
It's just a bit of friction, think of it like I'm giving you an egg. You need to carry the egg around with you and keep it safe, I'm not giving you another one. OK, maybe just one more. (But do try not to break it!)
But there are egg-as-a-service managers so you don't really have to carry the egg, just pay a small fee and someone will handle it for you according to the protocol. They are actually giving the managed accounts away now, if you wanted to remove all that cost and hosting friction and see what "superconducting feels like" J/K
The point about the identities is that they shouldn't be easily forged. If enough people do have them, if they're actually buying them, they won't have bought just one. They'll have them in bulk, they'll hold surplus, and they'll be careful about who they invite. You'll probably get one at no cost. Unless of course it's really becoming popular, and there is real scarcity. If Urbit is still around long enough for there to be any question of real scarcity, that will have been something else!
Just don't expect to purchase another one on any street-corner if you burned yours by sending spam, (then well it's better to have been a productive spam that made you at least back in value as much as the burned ID cost!)
Nobody really pays for this now. It's all million dollar art projects, and I think it's like the old days when you just went on IRC and who knows what you'll find!
I'm really glad to see you're willing to debate this in spite of having a strong opinion front-loaded, and I'm sure you're right about most people that heard of Urbit so far, ...but I think you'll find that many people will have only heard the good news and intentionally shied away from the controversy. We humans don't like conflict. No need to create it fresh from the bones of our ancestors, I say.
Or most people in reality probably haven't heard of Urbit yet at all.