Library - Wishlist ratio column

[woutercools]

Would it be possible to add a "Library - Wishlist ratio" column.
It would give an immediate indication of the game's value related to the Want-Have ratio of that game.

If nobody (0) wants the game: -100 (red) = no value
If nobody (0) has the game: 100 (green) = most valuable

Not sure which equation exactly to use.
In my example I used: W/H x 100 -100

What do you think?