At this point in his career, maybe he sees his skills deteriorating to the point where he won't be around in 2-3 years. He could see dollar signs and then charge mucho bucks for interviews and book deals and whatnot. Because if he'd be the one to bust the steriod thing wide open, he'd be on just about every news show there is. He'd be everywhere for about a month as the man who "helped clean up baseball," then he'd probably sign an 8-figure book deal. Plus he has a possibility of being considered the clean guy in this-even though he's already admitted his guilt, nobody will remember that in time if he ends up blowing the cover on everybody else.