..the feel of Real Wood and its just-right density / inertia.
Teak is also easily 'repaired' if dented - a warm iron + its oil = fixed.
Then too, it'd disappear on a Teak desk; precisely what a keyboard should do.
(I would Not like a Teak-monitor case though.. you can't fix a sow's ear with a cover.)
Now.. a Teak trackball body, with a ball made from the skull-bone of Karl Rove... in a Flash!