Different managers have different behaviors. Someone's trash is another man's gold. A player that does good for you may suck at another team (fresh case I sold one of my really good wingers thru negos and luckily the guy is on the same cup, so I checked him today and he has only scored 3 goals). I don't know about you but I sell at least 5 players thru negos each seasons and let me tell you after the new TM, age has lost its value a bit. I sell over 25 players for tokens all the time and even get the occasional offer for plus 30 players.