I am obsessed with numbers because in startups you will never have accurate idea and understanding of anything. Most of the time you will predicting and assuming things for accurate prediction and assumptions to make right decisions, you need DATA.
We are measuring WorkMonk on 29 KPI metrics and will keep on adding more metrics.
You need to know where you are going and with what pace as startups are about optimizing resources and avoiding making mistakes. Those who make least mistakes are the once with more resources (time/money/clients etc)