It always baffles me why people hang onto those - the likelihood is that there is at best only ONE interested party, and they may well take action to recover the name rather than hand over ransom money...
While an oblique case might possibly be made for ownership for a fan site, that would be in the case of a REAL fan site i.e. comprehensive, well maintained, etc. Stockpiling it with the excuse that "it could be a fan site" is disingenious at best, especially if the stockpiler's generally making money out of selling domains i.e. if they're holding a portfolio of domains with the specific intent of resale.
Personally I wouldn't look twice at such names, even if there were hundreds of thousands of searches a month for that person.