I mostly agree with the last posts.
Jon's system is more turn-key. What I do is simply publish what I9;m doing, including profiles I've made. Much of the old stuff is of no real interest to me any more, and I do not offer support for inksets that I do not currently run. People who want to run Eboni-6 and go beyond what is on the web need to be sufficiently proficient in Photoshop and/or QTR to do it themselves. I am not in the ink or profile business, but I'm perfectly willing to publish everything both so others can take advantage of it and to document what I'm doing for those who may be interested in the prints that result.
I print almost exclusively with QTR these days. The old Epson driver, Photoshop curves approach worked better in the past due to CM issues, but it was never as precise control as a rip like QTR gives one. From MIS's perspective, however, most customers don't want to learn how to use a rip. At this point, that's really not a very high concern of mine. I'm actually more interested in working with photographers and printers who are sufficiently into the art and craft of B&W that learning to use QTR is a minor barrier. I don't charge for the time I spend with these types of people because I very often learn something from the process.
MIS's web pages can be a challenge. I try to have URLs in the PDFs that get to the MIS pages that have the products I use. This is largely self interest so I can find the materials. I use my own PDFs. (And for the older ones, I often use Google to find them. My web pages are no better than MIS's.)
Eboni is a relatively unique carbon in that it can print more neutral tones than the typical inkset carbon pigments. Today, for example, I was matching a graphite artist's work on Arches. Graphite is cool. We did it quickly, and the 7800 is now printing 100% carbon limited edition copies of his original graphite/pencil drawings on Arches (really cool in more ways than one).
Paul