i've never heard of CD's being used and if i did i would avoid any venue that used them everything i want to listen to is on vinyl
........ you have obviously never been to a modern night then as the vast majority of MS DJ's take as many CD / CD-R's with them as they do vinyl.
For Y2K stuff (which is CC's bread & butter these days), you can search around everywhere and maybe find SOME of the tracks on vinyl BUT unless you have a vinyl fetish, why bother ?
If I like & want to dance to a particular tune, I dance to it ... I don't give a sh*t what media it is being played from (but then I spend nearly all my time in the Modern Room at events I attend so the OVO issue doesn't figure for me at all).
I find it a total laugh that DJ's such as Soul Sam have CD only tracks transferred onto carvers rather than play em off the original format, perverse or what.