In sheer credits, how much is the total cost of Fleet Carriers in the game? Would anyone care to have a guess?
Working backwards ...
Prior to Squadron Season 6 (when Frontier first announced that Carriers were coming before Odyssey) trade incomes were around 8 trillion credits per 8-week season across all squadrons. The average for seasons 6-10 after the announcement was around 20 trillion per season (with season 10 at 33 trillion)
If we assume that this extra income was gained for the purpose of buying a Fleet Carrier then that's roughly 60 trillion credits of extra trade income, just by squadron members on PC.
That would be enough to buy about 10,000 fleet carriers. (Add on a bit more for non-squadron players, console players, people who already had lots of money, etc. if you want, take off some for people who earned more than they needed or didn't earn enough ... for a rough guess that number matches up pretty well with estimates via the third-party tools of how many FCs there currently are)