Your fully-A-Rate Corvette. Let's not forget an A-Rated python costs more than a base-corvette, so are you suggesting the base-level Corvette should actually cost 1 billion, and an A-Rate version of your corvette costs 5 billion?Why should a Fleet Carrier only cost 1-2bn? My Corvette cost 1.1bn and it's nothing in comparison to a Fleet Carrier, either size-wise or facilities.
But an FC is just a glorified ship hauler with some anecdotal nice-to-have features; I can do way more with an Asp explorer or an A-Rate corvette than an FC ever could.
Market? Psh. Economy is screwed anyway.
Shipyard and outfitting? For what? Explorers have been out with enduring fits requiring no refitting mid-journey for ages. It's just a crutch for bad planning, and anywhere else is near facilities with outfitting.
Moving your ships around? Sheesh, that's a long time before you see an ROI on that one.
"Secure" trading? Smuggling's still busted.
Universal Cartographics in the black? See Shipyards.
And the forum has been no end of whining since FC's have been released, so much so we've got virtually no upkeep or jump cooldown now, and people demand "free tritium"... I wish I could just get free credits. Right now FD can't even do the simplest of fixes to make smuggling turn an actual profit. But it's all good, we have FCs! Yeah!
There's some very niche use cases for FCs, none of which justify a 5b pricetag. I've seen some people say "Oh, but my mining is made so much more efficient with my FC 1Mm away!"... yay... you mined 5b credits so you can... mine more. Bully for you.
It's just a textbook case of too many dollars, not enough sense. It's a glorified hauler, nothing more, and should be priced as such.