Not once did I say that the games are not important, infact the games are all that matters. But that said in order to win games you need good players, in order to get good players you need to train them or buy them. In order to make cash you need to sell quaility players, typically that you have trained.
Results are huge in merchandise and attendence income, but without good players you cannot win games.
Lets face it there are many different approaches to this sim, which makes it awesome! It is my opinion that a good trainer(level 4+) is well worth the money especially for teams just starting out. The transfer market is insane and usually is, so you are best to train from within.