Look at the defense he raised.
In this case I think it was a clear case of typo squatting. with traffic from their main site. I don't blame viagra for reacting. However he never raised the defense of being a registered affiliate with the right to use the viagra TM.
WIPO is like a court. It can only (I know they stray on this point) consider the evidence placed before it. The user never raised that defense. In fact it is apparent from his pleading he never even talked to a lawyer.
As far as I know I don't believe Viagra has ever pursued another case except for misuse of traffic IE sending it to porno sites etc. Anytime I have seen a Viagra WIPO it has revolved around those circumstances. But then I haven't read every case.
