Interesting take. But as a user, you are making me do an extra step because ultimately, we all want to know how much total ? I dont care if you charge 0.0000001 per user. I want to know whats the "grand total" that my wallet has to come up with.
But doesn't that depend on how many users you add? Would you rather pay $10 for up to 10k users, regardless if you have that many or a few cents as you work your way there?
I like the pay as you go pricing model over flat rate. Reminds me of amazon.