If a TMed domain is used in "fansite" or "sucks" fashion, thay are protected as long as the "rules" of "good faith" are followed. Just because a there is an established TM, it does not automatically give the holder holder exclusive rights to a domain name. If a TM holder goes after an infringing domain, they must prove 3 criteria. If they cannot prove all 3 criteria, the domain holder will prevail.
Be careful of what you read. Yes, Adobe and Photoshop along with Yahoo, Google and Ebay are very protective of theirs marks and they can overreach and try to bully domain owners. Then again, many domain owners DO register TMed domains hoping to profit from it. As long as the domain is used in "good faith" and cannot be proven otherwise, then the chances of retaining the domain is very good.