It&#x27;s amazing to me how deeply ingrained software profit margins are into the start-up world. That calculator...we&#x27;re an ecommerce company that holds inventory...I spent 30 seconds searching for how to set gross margins on the revenue then realized it assumes all revenue is 100% gross margin. In most businesses (read: anything other than software and maybe pharma), manipulating margin is one of the biggest levers (maybe THE biggest) you have to affect profitability.<p>Not to mention other big levers like working capital (and potentially running a business with negative WC and generating cash, a la Amazon). It&#x27;s funny to be running a start-up in SF and still feel a world apart from a lot of the ecosystem.