Because that's what we were offered, and CD-R is gay, and proper CD's are expensive. Tape is really, really, really not a problem with most people who buy from labels such as Intolerant.
Sign me up for a demo then. I'd like a CD-R too if its not too much of a pain in the ass. I guess you'll PM the details about shipping and stuff when its ready to go then?
Update: I have spoken to Intolerant records now, and the whole deal will be out on pro tapes with pro-printed covers in mid-March; perhaps earlier (perhaps later... Hopefully not.)