The most important is the health of the competitors. From 1984 to 2010, the death rate of major league pro wrestlers was ridiculously high. You can take nearly any profession, and even by percentage, people who served in wars (and weve run those numbers and people got inflamed by the results in all the wrong ways), rock stars, NFL players, and the death rates, particularly heart attack death rates of people who were heavily into pain pills and steroids, was high. The WWF did test seriously from 1992 to 1996, and during that period, things got a lot better. But for a combination of financial reasons, and competition reasons, they dropped the program. WCW tested, but everyone involved would acknowledge the WCW testing was a farce and during the early stages of the wrestling war, a generally older WCW main event roster was more physically impressive than a younger WWF roster. At one point Vince McMahon got so mad about it they ran skits accusing Hulk Hogan and Randy Savage of being on steroids, and at another point challenged WCW to do the same level of testing they were doing. When WCW started gaining in popularity, McMahon made the call to drop the testing. The death rate of wrestlers in the late 90s, and this cut across WWF, WCW and ECW, and all were bad, on a percentage basis there wasnt much difference, was horrible. It was not the same in Japan and Mexico.