That depends a bit on the situation, I have seen some people from rich companies who learned things like in the quote from Sir Terry Pratchett, aka the cheapest is not always the best option.

Some people also got rich in the first place because they either studied hard and got to be a specialist earning hundreds of thousands a year for their job and others just came with the right invention in the right time, and we overpaid for it. You see that especially in tech where the costs where generally pretty low (especially bookkeeping wise since the original owner's hours are generally not added in the bookkeeping) and they sold it for a lot.