I don’t understand what you mean by static in this context. 1Password costs more when you have more employees.

If you have employees, you’re paying hundreds of thousands of dollars per year for them. Paying an extra $10/m to save 2 hours of their time is still a profitable trade.

Two things: the first is that it's easier to estimate costs with services like 1P due to it being mostly static, unlike other services where costs are quite dynamic ranging from different factors like usage and hours spent. The second is that once you reach that scale (more than 10 members), your costs are so large on personnel alone that $10/person is an absurdity to be frugal about when it can save you time.