Like you have maybe noticed, we have in England the same problem, Austria and many similar sized countries have this problem. Teams in div III and IV come and go more often than trains stop at Utrecht station. For the BB game over all this is a loss, for the NT this means making progress for smaller countries like England or Holland is hard.
I think this is only a normal thing, and trying to force it to go an other way is probalby the same as forcing nature to do something unnatural.
It might work for a while, but in the end it will have devastating effects.
Some things are just natural, and it's best to accept it, way better then trying to artificially create an other thruth.
Some people will start the game and get adicted and stay as long as everything remains natural. Others will not get addicted and most of those will leave sooner or later, no matter what tricks you come up with.
The only, and best thing to do, is try to make the game as enjoyable as possible, and that way you wil get the ebst results as most people will stay a longer time.
The other most important thing is to get more people flow in the game, then leaving it, as everybody eventually will leave the game at some point in time.
So in short: have a steady and big flow of incomming players + make sure the game is enjoyable enough so many stay for a while.
:)
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