Here is an interesting link about testing:
http://www.abc.net.au/science/articles/2001/11/13/414717.htm?site=science&topic=latest
I expecially like the next to last paragraph:
"Dr Garlick recommends that people continue with their exercise routine. While there is a small chance it might kill you, it is more likely to save your life."
I think the issue with sudden deaths has more to do with completely undiagnosed problems, or problems that were diagnosed at birth and never seemed to worsen so weren't really followed. It also has to do with people aged 20-40, especially guys, who rarely go to the doctor!
Echos and EKGs aren't the cure all because they don't show everything. I had a friend in high school who had a murmur at birth. By the time she was a few years old, it had disappeared. Fast forward to 20 and she enlisted in the Air Force. She got through all of their tests, which included a Stress EKG and an Echo, without an issue. A few months later during a training exercise, she passed out. They diagnosed her with an aortic valve problem (BAV?) and discharged her. Granted this was a long time ago, and Echos have changed some since then, but it still makes me wonder what it would have taken to find her problem prior to her collapse. The newer heart scan, which is a fancy CT scan, might be a better test, but it seems to focus more on calcium and blockages. In any case, there is no way that insurance companies are going to cover echos and heart scans for healthy people so it would be out of pocket. There are about 12 deaths in the US of young athletes each year that are classified as Sudden Cardiac Death, and while one is too many, it's such a low % that the end doesn't justify the means for expensive, mass testing. If my problem was congenital, I would have had my kids tested.
For people past their youth, an EKG every few years would probably be covered. Anything else would probably depend on your history.
Found this on the Mayo Clinic site: "Routine use of heart scans on people who don't have any symptoms of heart disease is not recommended by the American Heart Association or the American College of Cardiology."