sigh Get a copy of the MMM and read it. TL;DR: adding more people to a project won't necessarily help make it go any faster and often will slow it down.

Immortality, I say half-seriously, since you can't spend time faster than anyone else.

You can't add more people to a project without slowing everything down. What else would you spend your money on, esp if you have enough that investing it may actually give you a higher ROI? You'd be well-advised to play the long game.