Well since the cargo hike morrigan does have a point with the amount of people flying liners. Right now they are a bit cheaper and much more accessible to buy then the proper transports.
However Xing you are right. Those of us who started flying liners way back when did so for RP reasons. When you look at a Liner you can easily believe that 4000+ people are aboard that ship. But when you look at an Adv Train its hard to picture 5000 comfortable (Or properly secure) people are aboard. And vice a versa with 'dry' goods.