I have similar reasoning, though i'm not as competitive as you in my other team. Yet at least. Training might be my favorite aspect of the game and it is great to have another place to test new builds. I'm mainly using my team to develop players for the USA U21 team and really enjoy doing it at that level because it is a more even playing field to see how your player matches up against similarly aged players internationally.
I do find that it is a bit time consuming managing two teams well though so I am not sure if I will be renewing again next year.