collectormania 

When a group of C-list celebrities (usually from science fiction films/programmes) meet up at a convention to sign autographs for ridiculous sums of money. Usually associated with the geek and nerd variety of teenagers.

GUY 1"Hey man you going to collectormania?"
GUY 2"Sure...as long as it doesn't smell of nerd like usual"

collectormania by rory mcmoose May 8, 2005

Collectamaniac 

A person that has turned collecting items as part of a hobby into a completest obsession.

When I mentioned to Kerry that I had over 18,000 records, CD's and Cassettes she said I must be a 'Collectamaniac'.

Collectamaniac by Plastic Demons November 7, 2008

Collectomaniac 

Person so obsessed with collectibles and antiques and the like that they really should just find a way to make it a business because it's taking all their time and energy anyway.

Christopher'd better just open a shop - he's such a collectomaniac that his wife can't even move in their house!

Collectomaniac by thejen_i May 1, 2012