Honestly, I really don't see any value or viable usage here. If you were not a domainer and actually trying to find info on snooker would you actually search for sn00ker? Most likely not. Even the far stretch that the zero sits right above the letter O on the keyboard, it does nothing for the name in typo traffic.
Couple that with every other extension still available, [including as johname pointed out .co.uk] it's a tough one even if developed. :imho:
-Regards