The problem here is that every time someone tries to extort an athlete or celebrity, it takes away from the credibility of all accusers. Athletes are sometimes the victims of bogus paternity suits and criminal complaints, which creates a stigma for future cases. The public perception is that the guys are always innocent. Combine that notion with the ability to afford a high-powered attorney and you've stacked the deck against legitimate claims from real victims.
Some prominent athletes who have been accused of rape actually did it.