I agree with most of John's point, even if I'm not into dirt bikes or any other motorsports. But there's such a big difference in cost of equipment between pool and bikes/cars and I don't think that's the best comparison.
Tennis is huge all over the world, many of us don't know which racket Federer or Nadal play with, but we all know they wear Nike clothes. Same for Tiger Woods. I think it's still a matter of media (tv) coverage, and the commercial target is "the fan" and not "the player".
Pool should be broadcasted more on tv, that's where money still come from. Live internet streaming is not enough yet.
I.e., in 2006 I first met John Schmidt in VA. I came over there from Italy to play in the US Open. John won it. I couldn't read a single line about that on any national newspaper the days after (but there were daily results on high school lacrosse).
Money would come to pool if a massive marketing campaign would be done by the governing bodies, finding deals with medias and tv. Different tries, like changing the rules or the equipment would be just maybe a little, temporary improvement but not the big thing we're all waiting for imo.
I want to give you an example last, because it fits this topic I think. Here in Italy the most popular cue sport is called 5 pins. It's played on no-pockets tables and their cues are very different. It's all production cues (no custom), made in a lot of different composites (carbon-glass-woodcomp-carbonwood and many more), 2 or 3 pieces, and every company comes out with a different cue every like 6 months. Usually the cues are named after pro players names, the average price is around $5-600 and people buy them. It's all a joke, because "average Joe"...ehm..."Mario" buys like 2-3 cues a year to stay up to date with new technology, but we all know it's just a smart business from the industry.
I don't know one single 5 pins pro player that became rich after that. Some of them now play poker, some work in billiard halls, some give lessons and most of them still gamble to make a living.
5 pins lived its only good time when their pro tour was televised on a big channel for a couple of years (about 10 years ago). Once that deal expired, they went back to anonymity and no more money.
If John would play on national tv, or pics of his wins were on USA Today, maybe just a few would know that he plays with OB Cues, but maybe a Pepsi patch would appear on his shirt and he would have finally credit for his talent and efforts.
Sorry for my English and for the length of this post.
(hey John, Happy New Year

)
Francesco