Most SaaS founders track MRR like a religion.
Monthly recurring revenue. It's on the dashboard. It's in the board deck. It's the number you say when someone asks how the business is doing at a conference.
It's also the wrong number.
MRR tells you what a customer is worth this month. It says nothing about what they're worth to you over the entire time they're a customer. And that gap — between what you think a customer is worth and what they're actually worth — is where most of the money in your business is hiding.
The number you want is LTV. Lifetime value. And it's almost never calculated.
Here's the basic math: take your average MRR per customer, multiply it by how long your average customer stays. That's baseline LTV. A $500/mo customer who stays 24 months is worth $12,000. Not $500. $12,000.
Sit with that for a second.
Most founders have never written that number down. They've optimized their entire business around acquiring customers worth $500 when they should be thinking about acquiring customers worth $12,000. The unit economics look completely different. How much you can spend to acquire a customer, how much you can invest in serving them, what you can afford to do to keep them — all of it changes when you know the real number.
But here's where it gets more interesting.
$12,000 is the floor, not the ceiling.
That's what the customer is worth if they never buy anything beyond their initial contract. If they add seats, upgrade to a higher tier, buy your implementation service, or purchase your adjacent product — the number goes up. Significantly.
A customer who expands from $500/mo to $750/mo at month 6 is worth $18,500 over a 24-month lifetime. Not $12,000. $18,500. That's a $6,500 difference from one expansion event. The product is identical. The lifespan is identical. The only thing that changed is that you captured $250 more per month for 13 months.
Now multiply that across your entire customer base.
If you have 100 customers and every single one of them expands by $250/mo at month 6, that's $650,000 in LTV you're currently not capturing. Not from new customers. From the ones you already have.
That's the LTV conversation. And most people are never having it.
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.