i sample off CD's primarily.
same way i sample off tape/vcr/dvd/vinyl/cd : it's just a sound or lick that you're after.
if you want the vinyl sound than there are plenty of processors and plug-ins that recreate well enough.
anyone whos bias one way needs to check their head and get out of the locker room
there are plenty of rare CD's as well > the Puma 45's are on a limited edition CD with bonus tracks (a big + in my book) as well as imports that don't see a vinyl release or CD singles that have extended mixes that don't see vinyl.
digging is digging but why keep with what everyone else is doing : went outta style in 95, DJ shadow got big and now everyone wants to be a DJ producer.
keep with your original idea and see what you need to fufill it.
and if the 'clean unorganic' CD sound upsets you > record the leader and the end of some wax and loop it > run it as a channel in your mix and process it...
peace