In the early days of Blacksmith, back when we were just a scrappy YC startup building a serverless cloud platform for CI workloads, we ran simulations to model our margins. We figured that with enough customers, the math would work out, and we crossed our fingers — but we didn’t have any real-world data to back up our predictions.About six months after we launched, I came across a blog post by Marc Brooker on the economics of multitenant systems. It captured what we were trying to do much more e...