Maybe to a fossil shop the small ones are of some value. The big ones definately are. Meglodon teeth (prehistoric shark teeth) do have value, especially the big ones. Some are 4"-5" and longer. Some fossil shops sell the small ones for kid's trinkets. Check e-bay, I'm sure there are some there.
If sharks teeth are valuable then I'm well on my way to a millionaire, the only ones that have any value that I know of are the really big ones 5+ inches .