Why have no John Sandford, J A Jance, C J Box novels been made into movies?

C. J. Box has had 2 TV series based on his books.

There was a Mark Harmon tv movie (I think) based on John Sanford's Prey books. Per Google there was also an Eriq LaSalle one but I've never seen either. I just learned about the Harmon one a few weeks ago, it must be streaming somewhere, I remember reading the plot and realizing it was a Lucas Davenport movie.

I read some of the Prey books a long time ago and have thought about just jumping back into them.

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armon one a few weeks ago, it must be streaming somewhere, I remember reading the plot and realizing it was a Lucas Davenport movie.

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I watched it on Tubi a few months ago. It wasn’t terrible.