Most companies that track LTV at all track one number: what a customer is worth on the current trajectory. Average spend, average lifetime, multiply, done.
That number is real. It's also the floor, and treating the floor as the forecast is why expansion never gets funded properly. So here's the math nobody runs.
The Blended Number
Blended LTV is your current LTV plus what orchestrated expansion adds, and expansion adds along two dimensions at once, which is why the math surprises people.
Take a base where the average customer is worth $24,000: $1,000 a month across a 24-month lifetime. Suppose the inventory says a third of your customers are a genuine fit for the next offering, worth $500 a month when presented at the right milestone.
Dimension one, more bought. The fit third expands to $1,500 a month. Across the same 24-month stay, those customers move from $24,000 to $33,000.
Dimension two, longer stays. Expanded customers see a path, and customers who can see their future with you don't go shopping for a new one. Extend the expanded customers' lifetime by even a year and they finish at $51,000, not $33,000. The lifetime effect added twice what the expansion itself did.
Blend it across the whole base: two-thirds unchanged at $24,000, one-third at $51,000. Average customer value moves from $24,000 to $33,000. A 37 percent lift in blended LTV, produced entirely by customers you already have, and the assumptions were conservative: one offering, one-third fit, one year of extension.
Why Nobody Runs It
Because every input comes from machinery most companies never built. You can't estimate fit without the inventory. You can't price the next offering without value per item. You can't believe the lifetime extension until you've seen milestones on display change how customers behave. So the math sits unrun, the blended number stays invisible, and expansion keeps competing for budget against acquisition numbers that are tracked to the decimal.
Unrun math has a price. It's the difference between the floor and the blended number, multiplied by your customer count, every year, compounding. For the base above, that's $9,000 per customer of modeled-but-uncollected value. That's not a projection of what customers might do. It's arithmetic on what they already fit.
The Latent Revenue Test runs a version of this math for your base in its sizing step: customers, fit, expansion value, annualized. Ninety seconds, no email required. The floor is what you have. The blended number is what you're leaving unrun, and you can't fund machinery against a number that's never been written down.
Lincoln Murphy formally named and popularized Customer Success starting in 2010 and has spent 15 years connecting it to expansion revenue and commercial outcomes. Read The Premise.