The only reason to use the Orca is for those luxury cabins. Otherwise, you're better off using different ships with better internals and range for that price.
I disagree. If your look purely at stats, perhaps, but you can get a great jump range with plenty of internals. Python can beat it for total internals, but it handles like a brick and is only slightly more stylish, and has a worse jump range. The orca feels amazing, even in super cruise! Mine is right on the edge of 50ly jump range with all the exploration internals I could want.
For passengers, I've equipped it with 4 cabins and take 2500ly passengers "famous explorer" missions. An Asp can have a touch more jump range, but can't equip that many cabins of any useful size.
I also think the orca is one of the best looking ships in the game, and a nice departure from the norm of most of the ships.
As far as I can tell, luxury cabins are useless. I've only ever seen two luxery passengers and they were only paying about 250k more then a first class VIP with the same route.
Name a ship with better internals and better range. (Excluding anaconda as that's three times the price and a bit silly of a ship to begin with.)