[_nalply]

No. You aren't always an expert about things you buy. You should not then start to rely on the price as a proof of quality. If something is expensive it is either good quality or you have a greedy seller. To catch the greedy seller you need to understand what you buy. This is not always possible. Therefore: always buy the cheapest you can get if you aren't an expert or just don't buy.

[heavenlyblue]

Oh wow, this is such a misguided advice.

Assume it is the same advice government takes when procuring public projects...

[_nalply]

The government has the task to know what it procures and also should have the resources for the task. However a single person doesn't always. Even for the government it is difficult. We all know stories about government being fleeced by providers.