I fear is costing the series readership.
You have no proof that "The Soul Key" sold less copies that previous volumes of the Relaunch. Idle speculation based on no facts whatsoever.
I haven't bought
The Soul Key, yet. 'Course, I haven't seen it in stores yet. So, in that regard, Ron's speculation is factually correct;
TSK has sold less than
Fearful Symmetry, because I haven't bought one.
(And yes, Ian, I know you, and I know you'll say, "Buy it from Amazon," but you know what? I
like patronizing brick-and-mortar stores. For me, Amazon is the
last resort, not the first.)
Seriously, though. If you consider the economic climate that led to Pocket scrapping the
Crucible hardcover and dismissing two senior editors in the tie-in office, then it's entirely likely that
The Soul Key will move fewer copies than
Fearful. On the other hand, it's possible there's still some residual new-fan interest from the film, and
The Soul Key could see a bump in sales from that. (However, I shudder to think what someone who doesn't know much about
Star Trek beyond the film would even
make of
The Soul Key.)
Ron's speculation may be "idle," but it's not unfounded. Readers will leave a series because they don't like it anymore or because they can't afford it anymore. Face it,
Star Trek books are a luxury, not a necessity.