There is only one non cosmetic item in the game that was available to some people because they paid for the game ahead of time and the availability of that item has been a source of wasted ranting on this forum pretty much ever since. Fortunately it is not a significant advantage to be one of the few with it but we don’t need to fire it all off again with another one especially as for about a fifth more effort while getting the money for your carrier you will have well over a years upkeep money to put in its bank.
If people rant for such things, sorry to say but they may not have a clear motivation. The fundamental problem with that mentality (not only in ED, in every game), is that people don't like to se others skipping the line by paying money in real life; because they have this "concept of earning" things. And the worst part is that some people feel like their experience is undermined if others buy things that they need to grind for. You earned your Conda, you don't pay upkeep; you earned your capital ship, you should not pay upkeep.
I can afford a car because I have a job, others take the subway or the bus... Same apply for almost everything, including the game and expansions.
Some pay money for expansions, while others do not, so they don't get to play the expansion content. Some games allow you to get content while you play by grinding; so at that point it is up to the player to decide if he/she want to pay real money or grind tokens for months to then buy the new content expansion or mission pack or what else. People with time save the money, people with money and no time save time. What is wrong in that?
What advantage is a carrier ship giving you, if you play solo and do not affect other players? It is not even something you can use in combat... It is a moving base of operation/station, so what is the advantage? That you make more money? What are the money for, if you can afford a carrier? At that point you should already have all you want. Also the economy unbalance would be negligible; the galaxy is so large that you may never meet a real player while you play out the bubble, so I really fail to grasp what incredible advantage is to have this floating boat with shops in it.
Why do I want it? Because it is in the game and because I like the idea to go out there and explore; I don't care about making money with it or what else. I didn't need a Conda either, but it is in the game and I like the idea to get the larger ship the game has, even if I do not do trading for money or for PVP.