The reason these ships will a buy only type thing is they need to CBS royalties for using Canon ships. Every ahip that isn't a cryptic original costs cryptic more money because CBS asks for money in return to use the design. The only way cryptic will get most of that money back to recoup the cost of royalties is through microtransactions. CBS has their fingers in this game, every Cryptic original has to be approved by CBS so that there is no kit bashing going on from canon ships that would cause CBS to miss out on any royalties.
I think they bought the IP ? That most certainly included ships. Any evidence to the contrary ?