If you look at the English Football League system, which most closely resembles Buzzerbeater-
The majority of the teams in the Premier league (Div.1) were established in the 19th century and have been in the top division for a while. There are a few teams that sneak in and make it to the top division such as Wigan but they are the minority. The powerhouses remain the powerhouses. http://en.wikipedia.org/wiki/Premier_League
Just my two cents and a real world example.
This only strengthen my claim.
1) This game is needed to be competitive for all users.
2) The NBA (and most of any leagues that exists in the USA) has a much better system and it shows.
It shows in the fact that you can see a game between each two teams and enjoy a meaningful game.
In England, and surely on Spain (football leagues) the only question is - how much goals Real/Barcelona will make.
3) Generally the USA's leagues systems makes the game much more interesting and competitive than the European one.
What happens due to this bad system in Europe is that the fan base are so not proportional up to a level that some (most) of the teams can be said to be playing and managed from charity.
4) In case you are claiming that this should be the case - only old users can play on the first division, ask yourself who will join this game and who will keep playing it.
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The basic of sport is competitiveness.
Currently BB is not competitive for new users.
I love this game, but on a certain point I'll probably do what a lot others have done due to that - leave the game (for the joy of some of the users who enjoy exploiting a wrong system)