Of good-looking black locust or osage orange logs say 6-8" in diameter (reasonably straight and bark is not twisty), I am happy if I get 2-3 good staves. If I get 4-6 staves from such logs it's a mighty good day. Seems I always find internal knots, mighty twists, etc that would only make a "character" bow from the rest of the logs. And needless to say, it takes some searching to find a straight tree in the first place with these species.
With hickory or ash, it seems I can often find straight trees with few obvious knots and make staves of most of the splits.
I wonder if the character bows we see nowadays were ever made by paleos, or if they just looked till they found good straight clear wood. I realize that in areas w/o good wood- far north, desert, etc- they must have used whatever they could find that would work.