I agree with Tara. I don't think it's morally wrong either, and you will definitely never go to jail for it. It just isn't quite ethical if you really care to preserve the integrity of the Internet marketing industry, I suppose. It's also a good way to screw yourself over if you want to maintain high search engine rankings. In the end, it will catch up to you, but don't expect to have the FBI knocking at your door or a priest shaming you for it. Just expect for your sites to fall off of the search engine rankings.