I originally used Tarsnap for a small amount of really important personal data. Data I already have encrypted, and backed up. But data I felt strongly about having a trusted off-site backup for.
It's small data, my billing account shows me I spend around $0.20 per month on this.
Without having been able to try Tarsnap, use it, come to trust it... I would never have had my business sign-up for it and I would continue with home-baked solutions for disaster recovery.
For a startup, being able to translate that utility pricing model to the backups we initially made meant this was extremely affordable and increased with usage (and theoretically our revenue).
I wouldn't have dropped $50 or $100 per month and so would have delayed, avoided and built our own system that was nothing as good as Tarsnap but fulfilled the basic requirement.
Later I'd be in the realm of thinking Tarsnap was reasonably priced, but would I change everything? Probably, but only when it was overdue.
The proposed pricing model introduces a big cliff to climb.
I wouldn't climb that cliff until it was long overdue.
It is precisely because the pricing scales with our use that I could try it personally, and for the startup, without fear of a surprise.
Perhaps I'm no longer your market.