I think it might be also lack of visibility. I was told about this book by friend who recommended it, not yet received it.
And I think I have already signed up for Creation mailinglist, but not sure since I never got any news.
If promotion only happens via website, sold direct to customers, I think eventually it creates as low profile as in... lets say "noise". Few enthusiasts know, rest don't have a clue of existence of some publication. I have the feeling, that years ago, if you followed noise/industrial, you pretty much found out about Feral House, Creation, Headpress, perhaps even Loompanics. Especially if you followed mailorder catalogues like Artware. Now, I see people who used to buy the stuff, being utterly clueless that Sotos put out like 5 new books and bunch of other interesting titles came out on mentioned publishers. But, in other hand, one can wonder what else to do? I'm sure for example Creation isn't pricey or low profile out of spite. Just the best way to keep it going for them.