What a rip-off—Epson ink.
Why? At print 250 or so (6X4", best quality), I’ve now gone through the original Light Cyan and Light Magenta cartridges as well as two each of the high capacity Light Cyan and Light Magenta cartridges. The original Black and Cyan cartridges are still going, but the high capacity Magenta and Yellow cartridges (having replaced the supplied cartridges at about 80 prints) are close to needing replacement also. At $120 for a set of 6 high-capacity cartridges, it appears that the ink cost for 6" X 4" prints will be approximately $0.50. Add $0.14/print for Premium Glossy paper.
A cost of US$0.64/print is four times the cost of a $0.17 Costco print on Fuji Crystal Archive. While I prefer the Epson prints, the Fuji Crystal Archive paper is well beyond acceptable for snapshots—and many Costco locations offer printer-specific profiles, so it’s not like one must accept inferior color rendering.
I really like the RX580. But I don’t want to spend $640 for 1000 prints! I feel duped. The Epson representative at MacWorld Expo claimed the RX580 would print several hundred prints on the regular (lower capacity) cartridges. The recent Kodak announcement might put pressure on Epson to bring down the outrageously expensive ink. Certainly a bulk ink system is attractive, but how can one know whether it will clog, and whether the color rendering will be comparable to Epson-brand cartridges? Please email if you have experience with a RX580 bulk ink system.