There's tipping point in growing software companies where the primary cost goes from Software Developers to infrastructure and when that tipping point gets hit

There's tipping point in growing software companies where the primary cost goes from Software Developers to infrastructure and when that tipping point gets hit it swings towards infrastructure costs almost exponentially. The reason is simple: computers beget more computers at a much higher rate than Software Developers beget more Software Developers. Doubly or triply so when you're in the business of storage like Dropbox is. At some point it might be interesting to calculate the size of your company in terms of how many racks you have and how many employees you have. These days a fully loaded rack costs a lot more than your typical Software Developer salary.