Why good for frames. plenty stiff, not noodly.
No good for for forks?
-CF forks are DIRT cheap to make. Just like CF frames-do you really think it cost TIME $5000 to make their frames? They are also light, stiff and reliable. Once you have a mold-you can mass produce CF forks quickly, and every one you make gets cheaper.
-Ti forks, like Ti frames require metal working which is expensive and time consuming. And every unit costs the same.
2) Metal properties
-Ti is lighter than steel but FAR less stiff. We're talking roughly 1/3 the weight, but also 1/3 the stiffness. To get a Ti fork that is as stiff as a steel fork-you'd need pipes that are FAR beefier (i.e. heavier).
Due to the economics a Ti fork would cost FAR more than a CF fork to produce, it would also weigh FAR more than a CF fork while not being as stiff. What advantage is there at all in Ti forks?
Remember a fork is nothing more than 3 pipes attached to one another-that is the limit of your structure. A bike frame has triangles and has natural stiffness and strength due to it's design. A fork don't.