I heard a story of a guy
Classic...
I looked around some. Checked 9 NT's before I got bored. There really arent many players sitting in an low division team. One of our own M.Raud is also in a low level team. But he has a high salary and is a "bouncer" usually in a bad GS. As a supporter I have put U21 and NT managers to my friends list and to be honest they are pretty active managers. If you farm only you don't watch the games. Be online every day and buy supporter.
I don't know what tools GM's use here, but proxys can be detectable. Prolly they could block/deny applications from openly marketed proxys.
BB is not WOW or Travian. Where you can either farm gold or create accounts for resource farming. It takes too long to farm the money to buy lvl7 trainers and NT level trainees and keep paying him after his salary skyrockets. Sure you get better money in small countrys, but it still takes time to build arena etc to maintain the player. It just seems too much effort for too little gain.
How many old teams are sharing their passwords after quiting? Do you have any numbers or just heard someone say that again. I can say that in Estonia, users either mention their intention to train NT players, when they lose intrest in the competitive game or have other goals (like getting DivIII and DivIV trophys). Almost every team that has lost intrest after relegating is a bot/going bot. I just don't believe that there are masses of farm teams in every country.