People wouldn't use things like Smeaton, Rhea, or Quince if payouts actually scaled with rank. The fact is that most missions barely let you pay for rebuy at the end game.
None of the missions come anywhere NEAR helping me pay off my conda type 10 or corvette ... with each one being at 30ish mil ( i actually think the conda is the most expensive one at like 35) ... Honestly i think a good fix for the passanger missions would be to up the price on the long distance ones without being stupid ... i saw one that was paying like 56 mil (which you cant take ANYWAY because its over 50mil) but it was 27k Lys out ... i could make that 56mil in like 2 days if i grinded the out of haz rez sites. the passenger missions just need some tweeking.
I posted an idea not to far back about how they should NOT nurf the payout ... but instead have ACTUAL pirates attack you during flight ... not this stupid one ship that i can easily run away from crap ... im talking a wing (or more) of ships all aimed at you... Make passenger missions like wing missions... where you have 2 or 3 wingmates guarding you ... and you have like 4-8 pirates jump in on you at once. THAT would be a blast and would make the payout/time/effort worth it imo.