There were a handful of players who exploited the system and amassed billions of credits. TNF at the time knew who was using the exploit but had no clue how they were doing it. They were able to keep the credits in exchange for showing TNF how the exploit worked. Thus dumping tons of credit into the NF economy that ruined the trade sysem for non-exploiters and new players. 

These same people used an exploit in the olive attendance system that was in place. Thus it was taken down as well. 

I'm not sure why anyone would want the trade system re-activated anyway. There are tons of Elites and Super Elite sailors that arent tradeable anyway.

Does anyone really want a pair of 120, 10/10 KM gunners? If trade is re-activated and you want them I have a pair...600mil. Who can afford them? 

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I could find many reasons why people would want trade back. Maybe not the vets of the game because they already have everything but I'm sure the noobies would love a chance to pick up the odd sailor they forgot to grind from the beginning because this game is so bad at teaching any new players how to do anything right.
THe fact that you can only trade non elite/super elite sailors is even more of a reason to allow it. If you guys aren't ahppy with a plus 12 sailor then don't buy him but trust me I have many +11/+12 sailors I still use to this day and they're just fine.

And just because some clowns ruined shit does not mean that they should just take it away. Like everything else in this game, removing things because they can't fix it is not a solution. Anyways that's another story. 

Its very easy to make $$$ if you know what you are doing. There are easier ways to level. Have cash to BVE your guys. Can grind with the insane XP that some rooms yielded.

Most of my crews were old school. +10, +11, +12 but all were properly raised and BVE with 200" vets. Elites and such were not around back then. So I sold the so called outdated crews and redid my crews with Elites/updated sailors. I made billions. Its really not hard.

Now how did the guys get the $$$ to buy stuff ?  Well all the accounts that were not used, given up etc etc. Usually friends got them or the fleets got them and all the credits got absorbed. I am not saying that some people didnt hack somehow but a lot made it the old fashioned way. And yes I have seen this first hand using many a different fleet +Fleet Accounts+ in Harbor assaults as fill in Battle help. These accounts had hundreds of millions in these accounts. 

sold my old US crew for 1b creds and 800m points, used to trade points for creds and visa versa which probably made me 2-3b creds back in the day.

If you look at the downsides of not having anymore trade, it is much worse. It killed of a good majority of players, it killed off the veterans who were waiting for their account only to come back and realize their crew was on a storage account, and can't be transferred. It killed off any new incentives to get a BB6 or CV6 because credit drop rate is so low (90% of the players in NF already have a 6, this just screwed the newer players). And in my opinion, trade does no hurt NF shop, there are players out there that have billions of credits, but don't have any money to buy anything from the NF store. So other players that have actual cash buys elites on the store, and sells them for credits in game. Trade has been a feature of NF for years now, and removing it made no sense. If tickets were the problem, it has been stated even in trade rooms that NF is not responsible for your stupidity if anything happens in trade room. If you decide to give someone your password and they stab your back and steal your crew, that's your fault. Taking away this feature made no sense and was just plain lazy.