"What if I get a $4,000 bill?" This is the most solvable fear on the list
"What if I get a $4,000 bill?"
This is the most solvable fear on the list and almost nobody addresses it before signing up.
Set a hard spend cap on the account. Not an alert. A cap that stops the service. Every major provider supports this and the default is off.
Know which of the two models you're on. Per seat is predictable and boring. Per usage scales with volume and that's where the surprise lives.
Run one process for 30 days before rolling out anything. You cannot forecast a bill you have no baseline for.
Then check the number against what the work costs today. If a task takes your ops person six hours a week, you have a real comparison. If you don't know what the task costs you now, the AI bill will always feel expensive, because you're comparing it to zero.
Unpredictable cost is usually a missing baseline, not a runaway tool.