Alright, here's a quick one for the Finance/VC crowd. My first year out of undergrad, I was crunching numbers on a Series A for a SaaS company. I got so lost in the unit economics – LTV/CAC, churn rates, the whole nine yards – that I completely missed a glaring red flag in their customer concentration. One client made up nearly 40% of their ARR. We pushed the deal through, and six months later, t