I think because they are basically just re-skins with a few BOFF and Console changes and also that they aren't the top rewards for gambling with the lock boxes. Personally I prefer the Mirror ships to the Tholian ships, Tholian ships have no place in Starfleet or the KDF, goes against the entire feel of the Tholian species established in the series and books.
Originally Posted by macronius
Cryptic is sloppy. Breaking News at 11. This is what happens when there is no outline or plan and you just make up **** as you go along.
Originally Posted by shredder75
We can tell our great grandchildren, "In my day, our cloaks were so sensitive that even dialogue broke them and we couldn't change our clothes!"