The reason Cryptic didn't use official Star Trek music is because it would have cost way too much to license (even though you would think people would let them use the music to make the game even better). But nothing is stopping them from going to a really good composer and doing music that is in the vein of Star Trek (the current music is ok but sub-par) and offering it on the C-Store.
Just an idea... do you guys like it or not really?
In fact, there isn't much of anything I'd buy in the C-Store. Perhaps character slots if I run short someday, or perhaps some exceptionally good costume items. Currently I don't plan to buy anything at all.