I like having these records about my palleter. I use them when I am making a decision as to what color to remove or how to simplify my palette, what colors to pick for the particular project. Or what colors to add to a yet new palette.
But I also use these when I need a boost. Making these record reminds me how much I enjoy just playing with color. And later on I can go back to these, see how I loved some color or color combination and would be excited to paint again.
These are useful when I need to reorder fresh tubes of paint too.