Interesting. To my point above, I wonder if it’s because there is no money in those sports?
Yes, in part, but drug testing is also part of it. Ben Johnson got caught and obviously FloJo was complicated:
https://www.forbes.com/sites/briangoff/2016/08/11/the-ghost-of-flo-jo-hangs-over-womens-sprinting-in-the-olympics/#524bb5b6667f
I've read that virtually all Olympic medalists in athletics (track & field) are on the juice. Angel Herida -- an expert on concocting PEDS, who worked closely with Bolt and dozens of other Olympians -- had an interview with Der Spiegel. Here are some exceprts...
"SPIEGEL: Mr. Heredia, will you watch the 100 meter final in Beijing (i.e. the 2008 Olympics)?
Heredia: Of course. But the winner will not be clean. Not even any of the contestants will be clean. (emphasis added)
SPIEGEL: Of eight runners …
Heredia: … eight will be doped.
SPIEGEL: There is no way to prove that.
Heredia: There is no doubt about it. The difference between 10.0 and 9.7 seconds is the drugs.
SPIEGEL: Can drugs make anyone into a world record holder?
Heredia: No, that is a misapprehension: “You take a couple of tablets today and tomorrow you can really fly.” In reality you have to train inconceivably hard, be very talented and have a perfect team of trainers and support staff. And then it is the best drugs that make the difference. It is all a great composition, a symphony. Everything is linked together, do you understand? And drugs have a long-term effect: they ensure that you can recover, that you avoid the catabolic phases. Volleyball on the beach might be healthy, but peak athletics is not healthy. You destroy your body. Marion Jones, for example ...
SPIEGEL: ... five-time Olympic medallist at Sydney 2000 ...
Heredia: ... trained with an unparalleled intensity. Drugs protect you from injury. And she triumphed and picked up all the medals.
SPIEGEL: Are you proud?
Heredia: Of course, I still am. It is still a tremendous achievement, and you must not believe that Marion’s rivals were poor, deceived
competitors.
SPIEGEL: This isn’t just an American
problem?
Heredia: Are you kidding me? No. All countries, all federations, all top athletes are affected, and among those responsible are the big shoe companies like Nike and Adidas. I know athletes who broke records; a year later they were injured and they got the call: “We’re cutting your sponsorship money by 50 percent.” What do you think such athletes then do?