Scott, I hate to be argumentative and I'm usually not, but I've always been skeptical of stats like these.
Assuming 300 million people in the USA (counting chilluns too), that means that one out of every 75 people are hardcore players, playing weekly or daily. I gotta think that's wrong - way way wrong. The Chicago metro area probably has about 7.5 million people (that's light, but keep the math easy), so according to this formula Chicago and burbs should have about 100,000 hardcore players. I have to think that's wrong by at least a factor of 10 and that's being generous.
If Chicago had 100,000 hardcore players there would be a lot more pool rooms here than there are. For example, I have to travel 30 miles to get to a room where serious pool is played daily. And lest you think all this hardcore playing takes place in bars, the entire APA has 265,000 members nationwide. I don't know about other leagues but together they're probably smaller than the APA. And, anyway, I hesitate to consider a bar league player who plays two or three games of 8 ball per week as hardcore, i.e., somebody who might consider PPV'ing professional tournaments or who knows who Shane van Boening is.