I think it is interesting that JNC has 'extras' in ebooks if/only if obtained via credits/premium membership whereas some other publishers only include 'extras' in physicals (and sometimes physicals at a particular store) --although for the most part this is true for original language releases (with Tentai being the notable exception)
I don't think it is quite a 'zero sum game' (every title that gets a print run = resources that cannot be used to translate/publish other titles) but I do believe that the way it is now, only the most popular titles (unless contractually obligated) get physical print runs. However; resources are finite, translators/editors are talent and their skills are not fungible (you can't throw just anybody in to do the jobs that Warnis or Quof do for example, because they are awesome.) So, there is something to be said about resources and allocation thereof. (I don't want to stick my nose into the workings /decisions internal to JNC- they do great and my non-expert opinions are not needed) That being said- if JNC decides to do a poll, ask for opinions :
personally, I don't need all of what I read printed on paper/stored/collected- but some things I'd like to see on paper, with fold out maps/color illustrations/quality bindings etc. (I've commented on the AoB fanbook previously). So, if there's a choice I'd vote for: "more content overall, even if much of it is digital only" vs. "many titles in print, but slightly fewer titles overall"
to sum up: if you're going to print something (and I'm buying) it has to be awesome/something special that I'll treasure/keep/show off. (and I'll pay top dollar) For everyday reading, I prefer digital