I think the issue with 3C, aside from not being able to find tables easily, is that it is extremely unfriendly to beginners. It seems everyone knows from birth that in pool you shoot the cueball into the ball and the ball goes in the pocket. If a beginner walked up to a 3C table, they can stare and think about it for a month and not figure out the rules or how to play and once they do it will take a very long time to get a hit and a very long time between hits. Due to the difficulty and play style, you almost need to be a B level pool player to start to get close to making a carom more than 1/5th of the time.