I find the following interesting; "Floyd Landis, a former teammate of Armstrong’s, was the original plaintiff in the case, acting as a whistle-blower with a chance to receive a share of any money recovered by the government."
"Landis, who also doped during his cycling career and was stripped of the 2006 Tour de France title, will receive $1.1 million of the government’s $5 million. In addition to the $5 million settlement, Armstrong will pay $1.65 million to cover Landis’s legal costs, according to lawyers for both Landis and Armstrong."

So, being a co-doper and fraud, does pay off.