Gary's (that's me) definitions...
Collector: One who obtains multiples of similar products and may not necessarily have need for them.
Acquirer: Also called an accumulator. Someone who has many not necessarily related items for no other reason than they like them.
Investor: A person that buys into "stuff" with long range plans on someday selling at a profit. This person is generally married and uses this description of self to allay their SO's financial concerns.
I've posted this elsewhere, but it applies here.
Collector, or accumulator? I think there's a difference.
As an example, someone who has or wants every Colt Gold Cup caliber / variation to me is a collector, while a shooter who over time acquires many similar 1911's in various brands, models and calibers and has the financial means to not have to sell to acquire more and / or has separation anxiety I'd call an accumulator
If you've ever seen the TV show hoarders, I'd call them accumulators more than collectors!
I'm afflicted with all three types, hang on... the wife is long gone so my investment claims are also long gone!
I hope this helps all of you put these issues to rest who are struggling with internal and external conflict.