If S&S does not do something about the prices, it's going to effect the entire Star Trek line as people are going to stop reading when they come up to the eBooks that are prices out of the realm of reality.
Vanguard is being priced out of reality. So when they find out that some of the stories do use elements of Vagnuard which they have not read in full or at all due to unrealistic pricing, they won't read the 24th century Trek eBooks.
I feel the Entire Trek line is in trouble with some eBook prices so far out of the realm of reality.
I don't think a few e books with out-of-whack pricing is going to threaten the line. People will simply hunt down the books used if they feel the e book is too expensive.
Or, more realistically, they'll do a quick google search and download it for free, while probably saying something like "fuck you, S&S!" The publisher setting stupid prices like that is hurting themselves, and the authors.