You just did not get it...
A team is not balanced. It grows every year.
No it is you that do not get it.
You don't grow if you are in a competitive league every year
It could grow money-wise, upon assets (Arena growth) or by player's value.
You make money, but you are also spending money!
You grow arena but it is capped at 20,000. No one builds arenas once they have reached around 21-22,000
Player values also drops due to age. Whatever value you get from training 3-6 players, will be more than offset by value loss due to ageing of all players on your team. All your money saved, you will be putting it back into new players.
If a team grows 1M (for example) each year, than it will be 10M ahead of a new player who joined 10 seasons afterwards.
It will be unrealistic to close this gap.
It is not as dramatic as you make it out to be and it CAN be done. We have had teams rise up through the ranks from D4 to compete with the top tier teams in D1. All it takes is playing the game with a plan and be smart about your decisions as to not invest too much in value decreasing assets.
As I wrote here, it is not true - the team could have more players, their value could be higher, or event the cash flow may grow
Cash flow does not grow. There is only so much you can get once your arena is maxed out and you have hit the soft cap.
There is no point having more players. Why would you want 30-40 players? Each player you have will drop in value due to ageing