What arithmetic is worth doing?
Per-seat pricing is easy to approve because the first invoice is small. The cost curve is the problem: every hire raises the bill on every tool that person needs, and nobody re-approves the decision when that happens.
Once headcount on a single tool passes roughly thirty, comparing the annual subscription against a one-time build stops being a philosophical argument and becomes an arithmetic one. Multiply the seat price by the headcount you expect in twenty-four months, not the headcount you have today. The same discipline shows up when we price AI consulting for a small business and when we choose build versus buy inside AI for Small Business work.
- Count seats you will need in two years, not this quarter
- Add the cost of the integrations you maintain around the tool
- Compare that total against a build plus its running cost
Sometimes the subscription still wins. That is a fine answer, and it is worth knowing that it is the answer rather than assuming it.