Sales of previous IDW comics show that "the more devoted fans who have watched and loved TOS" you mention didn't care enough for IDW's previous TOS, TNG or DS9 comics either.
What did sell extremely well for IDW were any comics related to the JJ Abrams-directed movie: "Countdown", "Spock Reflections", "Nero", and the film's adaptation in comic form.
Not really, not always. The worst-selling issue of Wrath of Khan sold around 8,300 copies, whereas the best-selling issue of the new film adaptation sold around 6,400. And here I was sneering at IDW's timely choice of publishing a Khan tie-in.
I buy very little of IDW's Trek output, but I bought the The Wrath of Khan adaptation. I had adaptations of all of the other TOS movies and was thrilled that someone finally was filling in that gap.
Hmmmm. IDW has recently started up a G.I. Joe book that picked up the old Marvel continuity where they left it off all of those years ago and ran with it. They recently announced plans to do the same with the old Marvel continuity of the Transformers. Given the apparent success of these "retro" projects, I wonder if IDW would give any thought to clearing up the hanging story threads from Marvel's Starfleet Academy and Early Voyages books? They wouldn't really even need a full on-going series to do it, just a mini or one-shot.