It's a great immersion tactic, too. Limiting yourself to your own games make the experience rather linear and pointless to a degree. Playing the other games breaths a lot more life into a given season.
What I tend to do is play every game that I'd watch in real life. So that means, usually, three games per week. If I play at noon, for example, I'll also play the best 3:30 game and the best night game of that week.