I am an extremely "focused" collector: while I love to see, handle, read about every sort of weapon (cold, hot, edged, etc.) I only collect things from Continental SEA. Indeed, I am so focused, I typically eschew most Vietnamese weapons as they are, to my eye, more Chinese than SEA.
I have, over the years, acquired some nice pieces from other areas, particularly if they are interesting or under-priced. However, I rarely keep those things around very long--if something doesn't "belong" or "fit into" my existing collection, it makes me feel...uncomfortable.
Yes, this is likely a condition one would find in the DSM-V (Diagnostic and Statistical Manual of Mental Disorders), but I am who I am.
One benefit of my compulsive collecting behavior, however, is I do enjoy collecting the entire spectrum of weapons from my favored region--plain, battle-weary examples happily reside alongside lavish beautiful things.