Simply because all of the supposed problems you've put forth are pure fantasy. I can't fix your imagination for you.
I see, so since you can't fathom a argument or string together a half bothered idea you go to a personal level, because?
In any regard, I can shed some light on some things for you, my imaginative world if you want. Since I in my mind made a few grand a year in that very business by juggling and playing the Auctionhouse for a few hours a day, it was fun and provided me with gold and money that my imaginary world could think off.
The company I sold to, today, I am sure do use shady stuff too, and when you consider a 0.5% to 1% yield is considered a good haul on accounts, is it really "not worth it?" these people, mind you mostly asian, usually run very decent profits, and the bigger companies that have now existed for 15+ years, are very profitable, most businesses don't even tend to live 15 years, so still not profitable ?
Now the games they target are ranging from small, to huge, small being stuff like Archage and guild wars 1. where player bases might be small. I have no clue, but imagine it being around 10 000 to 100 000, I would assume. 0.5% to 1% would still be 100's up to 1000's of accounts, buying gold, services or being compromised for phishing selling and other services.
Imagine bigger games, like WoW, FFXIV, or EvE. Suddenly the 0,5% and 1% now represents tens of thousands.
Then consider the range of pricing is on average about 25$ up to around 160$, so say the average spent is 50$. Suddenly you have a fairly hefty profit, and in a asian country where 50$ could represent a whole weeks salary, its suddenly a massive profit.
Do these businesses ruin players games, yes, both directly and indirectly, in WoW, no one really does progression anymore, a new expansion or a new char, you are max lvl within a day or two, getting from 90 to 100 in WoW without using a instant boost takes you about 1 hour. Blizzard continously try to fight them, now you can buy tokens, cleverly masked as "subscription tokens" that you can instead sell on the auction house for X amount of gold, and that price is quite fair to the gold seller sites, depending on regions.
So back to ED's current market, which I took myself the liberty to look for, and it relys on trusting one person to not scam you, and it is a very tiny market currently so it does not affect many people at all, and these exploits have been swung hard at, just 1-2 weeks ago a lot of these glitchers had their cash wiped. Not to mention it is seemingly now more towards "legal bits" of selling whole accounts instead.
Opening the "imaginative" door I am talking about makes a business stand behind, and the money earned ingame, is earned through "legal" ways, IE simply by playing the game, and not using bots, "But taht is totally not profitable yarp yarp " i hear you say, well no it is not, but in the long run, it is. Most companies use both. isn't that quite the shocker huh. So you got a lot of stuff making credits a legal way, meaning FD can't instantly slam the hammer at them. Large sums are them filtered around, standard practice to quite litteraly make stuff harder to trace, then when a buyer places a order, the company will usually and very often call to verify the buyer, and inform them about the order and send it onwards, then you have a lot of them sending incremental amounts of cash to the delivery account who trades and interferes with the buyer, the trader account is then discarded straigth away once all the smaller amounts have been sent way, well under the radar of "whapam a 1 billion credit trade!" and well away from the the real legally made mission money.
Mods can remove that bit if they want as it in simple moves explains the exacty route a gold seller transaction will work between a buyer and a serious gold seller company.
I don't want the above to happen to ED, as I thorougly love being in the game and theres no one spamming you, little risk of getting screwed over by people and those who do deal with it are actually being dealt with, and they are few as it is not a "house warm" thing. kappa.
But since you couldnt I'll air some ideas, since you managed to not read the part where I say its agreeable that everyone would like this, but opening the "imagination world" that seems to exist only in my head ( I can't and wont post links to pages as its against all sorts of rules ) I can't tell you much more than to open your eyes, and stop trolling about stuff you don't have a feintest clue about.
One way could be to limit what can be traded, and how it can be traded.
As an example to that, it seems most people would like to be able to trade because of X reason, and often related to RP and immersion kind of stuff. So limit the amount of tonnes one could trade to a weekly\monthly limit of 1000-2000 Tonnes, A bigshot trader will then lose out not being able to trade enough, and a lowshot beginner wont have a ship to even get near that limit. and at the end of the day, it would not be enough for someone helping a friend jump into a top notch ship. it would encourage people to perhaps have some form of races, and if someone wants to somehow conjure 1000 tonnes of ancient artifacts, painite or other rare goods I don't know.
It would make the game remain unappealing for any form of seller wanting to make profits as then the low % yield would have to be a lot higher, and the worlk load would be trendous to get around the limit in order to supply even a small amount of buyers.