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My rule was if i aint opened or used with in a year it pretty much went, although records were set apart from that.
I did a massive purge though and cut the collection roughly in half.
Also disogs is your friend on this if you have the time. Had alot of random house 12s that went for good money (over a 10'er)
As said above there are things people are willing to pay for you just have to spend time sorting it.
I go through phases, having had to move abroad i did one massive de clutter and it was surpringly easy and i dont miss much of it.
A few things i wish i didnt get shot of but that passes.
The selling part on ebay was the biggest hassle.
If i were to do it again id do a yard sale.