Resources are allocated to their constraints. You spend as much money as you have, as much time as you have, you hire as many people as you can afford, and so on.

It may be because people don't think on an absolute time scale but rather a relative one; if you make 1 million in revenue and you only have 3 employees, you might feel like you should hire more. What happens if you start making one billion in revenue?

Read Bullshit Jobs by David Graeber if you haven't already.