I am still old fashioned and buy CDs. I have a few high res downloads but honestly I'm not gonna pay for anything "rez'd up" that I own already in redbook format - which to me already sounds incredible. Since I have the HD800 (Jan. 2014) listening to music is so much fun again that CD's are piling up and can't cope with listening to all of them. But there are so many good suggestions in the music forum - I mostly focus on classic and Jazz - that I keep ordering quite a bit. Used "like new" CDs for $2 or 3 sometimes plus shipping vs a download for $17.99, no contest in my book .. or shelf
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To the original question :
I also listen to everything at least once before it get sorted into the shelf but I lost count somewhere past 2k.