I see your point, but bad example. Pool players would kill (figuratively speaking) for this kind of money. How is there so much money in Badminton but not pool? One big issue is that goods in pool are durable: my Diamond table will outlast me, and my 1993 Schon plays better (for me) than any cue I could buy.
On the other hand, if I play tennis, golf, squash, badminton, and most other equipment-based sports, then I'm willing to buy new equipment just about every year to gain a small edge.
Basically, in a sport where older equipment is better, sponsorship money will be weak. When newer equipment is better, or believed to be better, sponsorship money will be stronger.
This, of course, is just one of many factors.
Cory
Very perceptive post.....100% agreement.