Cardiff: the best value side in the Prem 2018-19?

The thread title is partly to get attention to a more general post. I found the 2018-19 squad costs for all the twenty Premier League sides, and then compared this with the points they accumulated over the season:

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The couple of things to note are that the "best value" side were the cheapest, and got relegated.

The champions were the most expensive, and the second least...

Cardiff: the best value side in the Prem 2018-19?