As I said in my earlier post, printing on a disk from the Epson printer was not even half the $1 per CD you stated. I think the original ink carts. supplied on an Epson printer are not fully filled.
I purchased a new set of inks from Sams at $56 for all inks, and after 100 DVD's I still have a lot of ink left.
In addition, if you query the forum you can see that there are a lot of substitute inks out ther for less than 1/2 that cost. I purchased some, but have yet to use up my original Sam's Epson ink.
For CD's / DVD's I think you can afford to go with the cheaper ink. The only thing I haven't tested out is if this new ink has a greater tendency to smear when wet. The Epson ink is great. So for now, at Sam's wholesale price, if I would guess, I would get at least 150 CD / DVD's for $56 which would cost out at 38 cents per disk for the ink. If the $25 for ink I got at Abacus is good, then my net cost for ink would be 17 cents per disk. If you buy a greater amount of ink, then you net cost would obviously be less.
Do some forum searchs, I've seen some people get ink at very low prices. If you can wait for these deals, and are willing to store ink, your net cost per CD / DVD will be a lot less.
IMO even at 38 cents per disk for ink it is well worth it. I think paper labels are ok for CD's because they are a lot less sensitive to warping, but using paper labels on DVD is only good if they are throw aways.