I think yours is a majority modern position. The SF that influenced Traveller is 50-60's, a grittier time. I like the grit, but understand those who want a shinier setting.As for travell in the OTU:
Passenger ships have been in the rules set as long as I know it (600dt Liner) and as a "10 percent of mass produced hull". So Travel must be resonable common.
As for the prices - I have always assumed that is the "frontier economic" where supply of shipping space and demands for it not always align and not the mass market of the core. That the big players like Tukki offer lower prices on the big ships. Ships that players MAY have served on during their first career (and still have the Mauve uniform with light green trim of a Tukera passenger liasion specialist in their spacers chest) but left behind (possibly with a case of PTSD triggerd by Mauve or passengers)
IMU the prices for freight and passengers may (depends on the groups interest) a baseline rather than fixed. If the group has fun with trade system and negotiations they are a starting point and can go up/down depending on supply and demand.
Oh and not high passages available on an adventurer class ship IMU