Anyone know why this Interleague series is so highly valued by MLB?

I agree. There is nothing special about this series. Neither have potential to win the WC or their division this year and havent the last few seasons considering neither team has been productive of a WS in recent years. I dont think theres anything special about this series and I think they basically just make it so it works out. I completely agree with you though. Great question with a complete explaination.