Payback in 5 Months: 4 Units at a library study area, on Paper

Scope and Shape of the Note

This note looks at people for 4 units over 27 months at a library study area, written from the buyer's side of the table. The figures are modelled rather than measured: cup volumes, price per cup and cost lines follow stated assumptions, and the arithmetic is left visible so a reader can substitute their own numbers.

The Arithmetic, Before the Result

Cup volume is stated per unit per day. Revenue is cups x 30 days x units x price per cup, taken at 12.6. Cost is consumables, the site share, power and parts. Payback is equipment spend divided by steady monthly net. No figure here is a quotation.

The model keeps the ramp separate from the steady state: the early months carry a lower cup count, and the steady figure is the plateau the site settles into once regulars appear. A reader who expects a different ramp can replace it without disturbing anything else on the page.

Month by Month, Line by Line

The columns are shown separately because the argument is rarely about the total. It is about which line moves fastest when a site underperforms, and which lines were fixed before the first cup was sold.

Where the Rows Disagree

The best month in this model nets about 27934, the weakest about 11271. The gap is the site's own variability rather than a change in cost, and that gap is what a trial period exists to measure.

At the modelled plateau, payback lands at 4.8 months. Read it as a reading of these assumptions, not a forecast: halve the cup volume and the same placement reads very differently.

Consumables scale with sales, so they rarely surprise anyone. The site share and the route hours are the two lines that do surprise operators, because both are agreed before the first cup and neither moves when the site underperforms.

The staffing Reading

The front desk is not in the contract, and it is usually the first responder anyway.

The person who wipes the machine is rarely the person who signed for it, and almost never the person who profits from it - which explains most of the small daily friction.

An one-page card with a name, a number and the three most likely faults converts a stalled machine into a two-minute fix; without it, the same fault becomes a story about the supplier.

The Follow-Up Worth Answering

Space is the constraint nobody prices correctly. A cabinet on a two-square-metre footprint can be worth a corridor and worthless in a lobby, and the difference is rarely about the machine.

Flow beats footfall. A thousand people walking past a cabinet convert worse than two hundred who queue beside it.

Checks Before the Cabinet Lands

1. Name who restocks, who wipes and who is called first
2. Put the contact card inside the cabinet door, not in a drawer
3. Walk the site staff through the two most common faults
4. Time how long people stand idle within three metres of the spot
5. Measure the delivery path: door widths, turns, lift depth
6. Confirm the trial period and the move-out term before delivery
7. Write the modelled cup volume into the plan and review it after month one

How to Reproduce This at Your Own Site

Reproducing the ledger takes five measurements and one honest average:

1. Write down cups per day for seven days, including the slow ones
2. Read the price per cup and the consumable cost off two actual invoices, one month apart
3. Add the host share, the power bill and the spare-parts line as three rows
4. Divide equipment plus installation by the steady net and round outward, never inward
5. Repeat the calculation at half the cups; the difference between the two runs is the risk

Four Venues, Four Different Curves

The same cabinet produces different curves in different venues. These four patterns are the ones operators describe most often, and each changes which line of the ledger moves first.

None of this argues for one venue over another. It argues for choosing the menu and the restock window after the rhythm is known, not before.

What a Buyer Should Take Away

Keep the arithmetic visible. A total without its lines is a price; a total with its lines is an argument you can win or lose honestly.

The trial period does the work that due diligence pretends to do. Thirty days of real cups beats three months of projections.

Third, agree the number you expect the site to do. Without it, every later discussion is about impressions; with it, the second month has something to measure against.

Where This Conclusion Breaks

The model is sensitive to volume first, the host share second, and access third. Two of those three are negotiable before signature.

If a supplier's payback figure is shorter than the one this model produces, the useful question is which input they changed - volume, price, or the cost lines they left out. The honest comparison is two models with the same inputs, not two headlines.

Common questions

Who should the site call first?

The operator, on a number posted at the machine. Faults that look like machine failures are frequently stock, cups or a socket, and those are resolved without a service visit.

How much training does site staff need?

About ten minutes: where the cups live, what the screen means when it flashes, and which number to call. That removes most avoidable downtime.

What do the modelled numbers actually mean?

They are the arithmetic of stated assumptions, not measurements. Every input is listed in the assumptions section so a buyer can replace it with their own.

Why show six months instead of a full year?

Because the first six months contain the decision: the ramp, the plateau, and the first sign of which cost line moves when the site underperforms.

Related reading

• Before the Second Capsule Order: exit risk at a hotel lobby bar
• $7,564 in a Good Month, $2,458 in a Bad One: Plan for Both
• 4 Months to Break Even, and the Inputs That Would Break It
• Where 24% of Revenue Went, and Why Nobody Priced It