Not sure if anyone has said this already, I did not read it all. Just some bits I (think I) know:
Training:
Height matters, age matters, potential matters, current skills matter (soft cap against the potential right?), whether you are training 1, 2 or whole team in positions (doubt team, but hey) and probably more stuff I cannot think of.
Stadium and money:
I have never had any problem with money, always getting money each week. I joined mid season and didn't know what was going on, but the next season I destroyed my league not losing a single game, always filling out on my stadium, then when I progressed to the league above I upgraded my stadium and barely filled what my previous size was. I think this is down to fans general happiness? When I have won my last game, last tv game, and last rival game, I had 5 star (well, ball) total happiness. And I almost filled out on my stadium (apart from like 10 of the 2nd from top tier and 2 of the top tier seats). But when I lost a game, I was like 700 below my total. So I suppose how you are performing counts, so if you are just losing all the time, no such luck that you are going to get money.
One thing I think that should be put into the game. Although I am not sure if it is in already (haven't noticed it)
So far I believe that it is more beneficial with money if you are in the relegation zone to just get relegated, destroy the league below (and in doing so get mostly full stadiums) and then come back up with some bonus money from wining your league on top of stadium money, whereas if you stay up you wouldn't get any league winning money (unless somehow you won obviously) and if you were a mid table team, you would be losing a fair few game, and so not getting constant full stadiums.
So I think they should ad prize money if you come 2/3/4 and maybe even slight amounts of money for staying up in the relegation zone. But not entirely sure if they have this already? Or if they think stadium money is enough.
That is just my hypothesis, may be completely wrong, but I think it is not too bad
