It took me some time to understand and I still dont know what server I am on, nor do I give a **** anymore. The only thing you need to know is that when you keep winning, apparently you get grouped with other better teams and friends. As you get better, the amount of quality players lessens to make it so you will go nuts in bidding wars for the paltry amount of 4/5* players you sometimes get on the auction list. OR it will piss you off so that you end up buying tokens and scouts because of the lack of quality players to buy from the auction list.
I am sure someone will explain it better but for me, thats all I need to know.
how does that affect you? Same as me. I decided to tank a season. That means to come in 8th - 14th so you dont progress to the next level and your players lose a star as your competition gains in quality. You lose out on the money you win from being in 1st - 7th, and no Champions League games next season, but it gives you time to build up tokens and boosters and skill points so that the next season you will have a team full of 4/5/6 * players and can compete with the best of them.
Tanking a season drops you down a notch in terms of level of server. What does that mean to you? it means you will see more 4/5* quality players on your auction list. If you tank 2 seasons in a row, you will see a ****load of 5* players.
Since there is no best league to be in, and there are infinite amounts of leagues, you can never be the best team, so advancing levels means absolutely jack-squat.
So if you want 5* players on your auction list, tank a season or two and you will see them guaranteed.