I think it depends on how you define a terrible buyer. In my personal life, I make different buying decisions all the time – sometimes I buy quickly without much thought to cost cause I need something (trapped in airport for example). Other times I spend a huge amount of time doing research on best quality and price. Other times I pay a little extra to assume better quality.
So I call fiction. Government is a very unique buyer and that affects how it does business. It’s not always the fastest or gets the absolute cheapest price. But it does a really good job and spends a lot of effort to ensure that procurements are open and fair which is essential when viewing whether government is succeeding.