CiG
Approximately Infinite Universe
I hate buying demos... Paying $12 for 12 minutes of music is brutal in all the wrong ways and I feel like my ass isn't going to get up and put it in the tape player (or vinyl for that matter) in the single room I have in my house that has one to listen to something for 12 minutes (if that) very often.
A few exceptions exist, my Necromantic Worship tape is a beast and my This is Not Doom! Tape by TLoT is great but I still feel like I'd listen to them a lot more if they were just on a disc I could put on my computer.
Tl:dr: I'm too busy and/or cheap to want to give demos time.
Never paid that much for a demo. You're doing something wrong.