Though this would be avoidable simply by adding a few more zeroes to Rackham. If he was a quadrillionaire instead, then at that point, sure, the very richest PF Commander might - if they spent all their money - be able to buy a planet. But the (above)average mercenary commodore with their FC and crew certainly wouldn't - while still nevertheless commanding a decent amount of local power and influence.
Sure, the in-game economy doesn't make a lot of sense but the story could still be scaled to it.
They
could... but what does that look like? Like... what does a net worth of 1 trillion look like in the universe?
The total stock holdings of
this station at galactic average prices is ~135 billion. There's five like it, then there's the planetary settlements... odds are the total stock of that entire system would be coming close to that, if not a half to three quarters of a billion (given there's five similar outposts)? So let's say a system of 13 billion people has a roughly output of 750b of goods available on the market. The galaxy has about 6.6 trillion people in that. So to scale that out naively[1] So the galaxy in terms of it's market commodities is worth roughly 381 trillion[2].
So... Rackham being a quadrillionaire doesn't make a huge amount of sense in that (very rough[3]) context, since where would all that money actually lie?
Of course, the world starts coming apart when you start talking about things like (the artist formerly known as) Borann, CG payouts (and CGs in general)... and let alone how Rackham can have any money at all considering how much he pays for Wine

.
But anyway... Rackham has a net worth of 1 trillion, in a galaxy worth roughly 381 trillion... or roughly 0.25% of the galaxy's worth at a point in time. Incidentally, Elon Musk's worth is $220b USD in our world where the global GDP is ~80 trillion... or roughly 0.25% again... so this tracks and matches expectations.
... so the fact there's people brushing this off like a nothing-thing (which I think is fair enough) kinda lends credence to the fact there's a substantial amount of cognitive dissonance needed to be comfortable with the idea that random commanders matching this is "no biggy"... which suggests there's some core issues with the way the game portrays itself (and it's stories). We could just add zeros to Rackham's worth, but for it to make any sense, the value of the galaxy needs to prop up too.
[1] not all systems are the same. The market product of a 22b population extraction system would be much, much higher than that of a 22b pop colony, which only produces biowaste really.
[2] Would love to actually see the numbers on this.
[3] I calculated this based on a Refinery economy and scaled it out. Reality is the galaxy's net product value is probably much less.