And why should it be usefull if anybody could go to the new servers?
What would happen if there would be - let´s say 20 players lvl 100, every crafting lvl 100, every pet/draco/... and top gear?
You want to show the new ones "Hey look how cool i am - i´m playing since XY and now please pay me for leveling/answering questions/crafting your first equip and then farming your second,...."
If this was possible then there would be nio need for a new server....