At what point does it make better economical sense to send a well paid project manager to oversee dozens or hundreds of engineers being paid artificially deflat

At what point does it make better economical sense to send a well paid project manager to oversee dozens or hundreds of engineers being paid artificially deflated local rates? Looking at the STEM numbers, there will definitely be a glut of engineers. At least with an H-1B visa, they got a ticket to Disneyland. https://www.forbes.com/sites/niallmccarthy/2017/02/02/the-countries-with-the-most-stem-graduates-infographic/#626c443268ae https://www.forbes.com/sites/niallmccarthy/2017/02/02/the-co...