I would think its purely the number and not the unwillingness of KDF fans to spend money.
Considering we are 18% of the playerbase, who would ever silly enough to think we could out buy the feds in numbers?
I'm curiuos how many of the KDF players bought the BortasQu' overall. We may have less in comparison to the feds but may have had high numbers within our on playerbase.
I also think that the "free" Bortas left a bad taste in the mouth of many Klingons who were looking for a hammer but ended up with an anvil. Unless youre slow STF'ng, cannon type weapons are nearly pointless on the ship, and the fact that the Gal-X runs rings around it doesn't help much either. All that Zen to pony up for the full set is a lot to ask after demo'ing the freebie model.