I do the same thing. Now I buy mostly new stuff monthly that comes out in Pop and Country, guaranteed uniqueness that way too.
I was estimating about 20 - 30 % duplicates in an average buyer's collection. You're right about there.
ex. 2900 / 13,200 = 21.97% : Towards the low end, good.
Anyone else wanna offer their duplicate % out of curiosity.
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