Don't think the issue was ever about the number of cards ruined, it was about trying to clean up the sport to get it allowed into the mainstream to make the most money possible.
If you think that The UFC was making less money than it should have before USADA because people were turned off by fighters who appeared to be cheating by using steroids, how do you explain the success of Brock Lesnar who at the time set the record for the highest buyrate ever for a UFC PPV, yet he looked more like asteroid user than anyone else on the roster?
Think about it. Their biggest draw was the guy who looked the most like he used steroids. How does that translate to a drug fee UFC potentially making more money? It's nonsensical!