I have well over 5000 Metal CDs, that includes 400+ Compilation CDs and 48 Tributes CDs.
I also have 37 Comedy CDs and 150 Hard Rock CDs. I own 0 CD-Rs unless they were released that way, in other words: no 'burned' CDs.
I have been collecting CDs since 1989 and doing a distro since 1993, so I get a lot of them that way. I also did a radio show for over 6 years and got a bunch of promo CDs.
I have 1200+ cassettes too.