I don't know. There are a lot of reasons why new players don't continue playing anymore. As you've stated already, getting told off is one thing. But then again, and that is my unpopular opinion, is that the server is way TOO restricted. It won't take long until admins start to interfere with your game for something that either you did or someone that did something to you. There are too many players that immediately complain to higher-ups because they don't get what they want.
Another reason, and I think that was stated above, is that these new players are raided. While there is this ''gentlemen rule'' of not raiding newbies, it happens nonetheless. I find it easy to say for older players that they should deal with it, because that is part of the server, but not everyone has 200k-500k on the bank and can spend money on making the most high-end gun. You can give the newbies a handgun, sure, but what can they do against 2-3 fully geared players? It happens, and it scares people away from the server, which I give them full reason to. It is difficult making money in the game, especially with these big orgs breathing in your neck, its a risk every time you are online.
The game is not fun when you have no cash, and while new players give multiple options to make money, there are not a lot that are really interesting enough to continue doing.