I think that what best describes my collection habits is that I am a collector of acquisitions. That is, everything I strive for is suppose to be hard to find AND something that I like. That makes for a customized and challenging search. In short, it's fun. Here's an example-list of things that I acquired or look for.
A Meta-Knight plushie,
Various swords, including a Kenpachi Zaraki blade (from Bleach),
The Uzumaki live-action movie,
A Guy Fawkes Mask,
Neil Gaiman's "Sandman" collection,
Persona 2: Innocent Sin and the means to play it,
An army-surplus gasmask,
And even Tokyo Babylon, which is supposedly out of print.