Sometimes it's just a regional thing. Some influential guy uses something and the rest just follow suit. I travel all over Canada and the US on business and always try and play a little and soak up the local vibe. The guys in Chicago for example you will see a bunch of local makers like Ed Young (great cues) and you could survey all of LA and not find two (Samsara and Tad country). Snooker rich areas you will see a lot of ash. Some guys (like Mark Gray) still prefer their 3/4 style ash snooker cues for pool. Without closely looking at one I'm not sure if they bump up the OD from 9mm to say 10.5mm to handle the heavier balls.