Hi -
I could not do the red-eye turn -- Hate 'em.
That said, I booked 7RTs PDX-EWR turns. While not double miles, they ARE same-day daylight turns. Leave PDX at 630, arrive back 715PM. My usual annual MVPG travel gets bumped up to 75K.
Bennies? The miles, the transcon UGs, the day passes to the Alaska Lounge. And even if you don't live in the PNW, the miles can be used in a variety of places.
Finally, look at the incremental cost -- 7RT transcons at $191 each, $1337 total. Without it, I get 80K miles from MVPG travel. With it, I get 90K from that same 40K BIS miles (so 10,000 more -- I did the same thing last year). Add in about 80,000 total RDM from the runs. Add in 50,000 bonus. Add in 4,000 from incremental cc spend. Add in 4 more GGUs. Add in Lounge passes. So, 140,000+ miles for $1337, or less than $.01/mile.
And, I should add, AS wins also. They got $1337 in incremental $$ from mw at a time when the all of the flights were 1/2 empty or more (though 1st was full!). And the topper was the 1-day flash sale, as the OP noted.