So right now I am shipping 500 units o fElixirs, 840 Passengers, 100 spaceship crew, 400 synth Paste, and 150 units of water in my Albatross.
As I plan my route I got to thinking about "What if the ship grade (Luxary vs. trash dump) gives you a percentage bonus in sale price based on what you fly? Strictly on personnel.
Why not go further? Buy modules such as, bars, clubs, buffet, ect ect ect that takes up some cargo space but helps with the bonuses being a luxury ship transporting passengers, VIPs, any other persons.
I believe this would give unique properties to Lux ships.