Each season, 45% of the total summed Team Salaries money is put into the final league pay-out. And so, it is just as, and perhaps more, important to finish consistently well from year to year. Of course, just as with the issue going from monthly to a seasonal pay-out, it is understood that the manager who wins the season standings is also going to win the league.
Basically, the best strategy to take away from all of this is just to field the best team every single day. The manager who has the best team will win the most money in the end.