"In real life the truck drivers do not make net earnings of ten times more than miners on average."
They're not truck drivers though, they're effectively merchants or traders, more like we saw in the days of the East India Company and the like. A trading ship coming back to England from the Far East (rares trading!?..) made the equivalent of millions and millions of pounds in todays money per trip.
Traders/merchant vessel captains own their ships, are responsible for all expenses, repairs, wages, cargo, and they still have to do the actual dangerous travelling despite being the boss.
Unfortunately it's not really a job that properly exists anymore, which is why I think people have a problem equating it to the real world. The closest we can imagine is a trucker, or a cargo ship captain maybe, whereas I think the spiritual successor to the merchants are more like commodities traders or the owners of huge haulage firms. And lets face it, these guys are in fact paid a hell of a lot more than ten times what a miner/bounty hunter/ explorer would earn. I wonder what the career earnings of Dog the Bounty hunter are compared to a guy who spent his life bringing back 50t of silk/saffron/tea at a time from China/India?
And as someone pointed out earlier, how many poor explorers are there out there, making the big bucks charting rainforests? Exploration has always been something done by people with enough money to have the free time to think "Hey, whats over there? Lets go and have a look, I may be some time darling!" Either that or they are pre-funded by Kings/Governments/private corporations and are further rewarded (or not) post-voyage when you return (or don't!) with some great discoveries (or not!)
In short, I think trading is exactly as OP as it is supposed to be! And yes it's also mind-scrambingly boring, tedious, piratey (esp. Lave etc). That's the trade-off for making a tuck-fon of money.
EDIT: the whole thing was in italics for some reason.