If companies (specifically management) were actually competent, they would know that it takes $20k-$40k to fill one position, $80k-$100k for that individual to optimistically ramp up to an existing employees productivity. All this takes at least 1 year.
Instead of the time and money spent, they could easily boost the compensation of an existing employee by $25k and not lose money or time.
But of course, nobody ever claimed that management is competent.