If Colin is attracting people for whom the difference between $0.03 and $0.30 is meaningful, then Colin is attracting people that do not deserve to do business with Colin. Colin was involved in security with BSD, and made a no-BS almost bulletproof encrypted backup solution on top of untrusted hardware, and has created something of
actual value. Anyone whose data is worth less than, oh, call it $100 a month (at the low end) doesn't
really need Tarsnap.
I respect that everyone has their own motivations for doing things and that economic optimality is not the be-all-end-all. Colin can run Tarsnap as an underpriced public utility if he wants to. But, Scout's honor, it is underpriced. The pricing model actively discourages large, savvy customers whose lives and businesses would benefit from switching to Tarsnap in favor of pathological bottom-feeders who gain no significant benefit from Tarsnap. My personal opinion is, in addition to costing Colin money, this moots the impact that his (extraordinarily impressive) engineering achievement could otherwise be providing to the world.
This is a very awkward conversion for me, so I'm going to refrain from the unsolicited advice for at least a few months until picodollars just make me snap again.