If I make a money printing machine, why would I sell it for less than the money it can print?
1. because usually "money now" is better than "money later" (obviously depends on
how much money now, how much money later and how much later)
2. because that machine requires mantainance and maybe you don't want to bother with that if you have an alternative
3. because just selling the machine is usually much much much more simpler on a bureocratic perspective, than "creating money"
, at an uncertain amount and valuation.