The most expensive line in an AI business case is the one nobody wrote.

I've sat on the selling side of more than 50 AI business cases in the last five years. Almost none of them had an adoption number. They had a seat count, a value per seat, and a multiplication. Nobody lies about it. The adoption field gets left blank, and the spreadsheet treats a blank as everyone.

That blank has a name here: The 100% Assumption, the business-case line that assumes every licensed user will use the tool, every week.

Who is paid, and when

The deal closes at signature. The project closes at go-live. The renewal lands on the buyer, alone, months after anyone could have changed course. I call this the Shelfware Economy: a market where every party is paid before adoption is measured, except the one who pays for it.

What it costs

Surveys put weekly use of licensed AI assistant seats at 20–30%¹. The tool works and the licences are live. Nobody tracked whether the people it was bought for ever opened it.

I'm not writing from outside this

I've built approval gates in my own CRM that made the data worse while making the dashboard look better. Rigour that demos beautifully can still poison the record. Some of these essays are about me.

Buy all three parts

Swapping tools won't fix it. Fund the other two-thirds too: the people whose week has to change, and the tracking that shows whether it did. Machine in the Loop is my name for buying all three parts, not only the one with an invoice.

Three things to put in the case before you sign

1. 01Measure. Replace 100% with a measured number: weekly use, in the workflow the case depends on, at month six.
2. 02Own. Name one owner per use case: the person whose week changes, not the sponsor.
3. 03Track. Track use from day one and read it every month, not once at renewal.

Questions this answers

What is The 100% Assumption?

The business-case line that assumes every licensed user will use the tool, every week. It usually isn't written down: the adoption field is left blank, and the spreadsheet counts a blank as everyone.

What is AI shelfware?

Licensed AI tools that are paid for but not used in the workflow the business case depends on. Enterprise surveys reported by Fortune (29 May 2026) put weekly use of licensed AI assistant seats at 20–30%.

What is Machine in the Loop?

A name for buying all three parts of an AI system: the machine (licences and models), the humans whose week has to change, and the loop (tracking that shows whether anyone uses it). Humans drive. Machines accelerate.

How do you measure AI adoption?

Count weekly use in the workflow the business case depends on, at month six, not logins. Name one owner per use case, track use from day one and read it every month, not once at renewal.