Mileage Run Discussion - Do Cheap Runs from Haneda (Delta) Exist?

My main base is Haneda (nothing "quick" about a half-day trip to Narita before a flight...) and I'm beginning to wonder if there are any cheap Delta mile run routes from here at all. Even nearby Seoul only exits via Narita (and for 40,000 Japanese yen).

Anybody know something I don't? Are there any people that utilize Haneda for Delta runs shorter than 4 days total? Where do you guys go/depart from?

whats the c/mqm of cheap?

Since time is more of an issue than anything (usually couldn't try anything longer than a weekend run), it would need to be closer by. But I feel stupid spending roughly $600 for a 2-day itinerary. Is this just the reality? More than anything, I entered a few award builder deals a while back, so even a short flight would help those benefits to materialize.

If this was America, a jaunt to the next city over would do the trick, but out here I feel like a hop of the same distance would cost 10 times as much...