Sure it is.
Look at it this way. Player 1 could build his team, train, build up his arena, and do everything besides day trade extremely well. He could do this for few seasons until he has managed to climb a couple of divisions, and is working his way to the top.
Meanwhile, player 2 comes in later, and in a single season of daytrading has the money to buy a better team than player 1. He will enevitable catch and pass player one because the amount of money one can make in the market daytrading is essentially unlimited, while the money one can make in any other facet of the game has definite limits.
Maybe its just me, but I had the impression that people were supposed to rise to the top gradually based on overall managerial skills, not by mastering a single all-important element.
Look, I love this game, and accept it how it is, but there is always room for improvement. I also feel it is important to make sure that the game is balanced to keep it interesting in the long term.
I'll use my own team as an example, I know that I have made some mistakes in developing my team. I couldn't decide early how I wanted to train, so some of my trainees are a bit behind the curve. I also didn't build my stadium as fast as I ought, leaving mne a bit behind some contemporaries. That being said I think that I have done a relatively decent job of it, and financially I have had steady growth. Yet there are a large number of players in the game who have been here half as long as me who have 10 times the money I do. That does not make sense to me. Even if my stadium was triplet the current size, and selling out every game, I would not have the money available that some of those guys who have only been playing a month or two have.
This seems odd.
This is only possible because day trading is obviously superior to any other facet of the game. So superior that many people here feel they cannot compete with it, no matter how well they manage their team otherwise. I do love this game, but when it reaches the point that I am forced to spend my time scouring the market and crunching numbers just to compete then it will not be nearly as fun. (even though I will probably still play because it will still be better than most other games)