> With enough traffic and revenue, you'll get a positive return on hiring a bunch of engineers to optimize things that wouldn't be worth it for smaller sites. W

> With enough traffic and revenue, you'll get a positive return on hiring a bunch of engineers to optimize things that wouldn't be worth it for smaller sites. With enough engineers you'll get a positive return on hiring engineers to make engineering more efficient. The problem is that no modern tech company I know actually measures the ROI of this (positive or negative) so it's completely unrealistic to determine the IRR on it. In other words, there might be a scenario where it actually is more profitable NOT to do it.