thingaholic
A packrat; a collector lacking discernment or moderation; a person who compulsively accumulates obsolete or useless things; an eBay addict;
Packrat: Hey, boss, look at this pager that I got on eBay!
Packrat's boss: (Staring at Packrat's messy workbench) Man, you're a thingaholic.
Packrat's boss: (Staring at Packrat's messy workbench) Man, you're a thingaholic.