Ehll Tou is amazing

[Illmaeran]

but certainly better than spending hours grinding dungeons.

For what it's worth, I get 9 to 11 minute runs of Shisui (lvl 63 SB) on lvl 90 WAR, PLD, and DRG in the level 580 crafted gear. Depending on how many doubles drop, it's anywhere between 10 and 13 items per run. I haven't tried selling them in Doma (thanks for the suggestion!) but they're 1290 GC seals each and are a great way to get the minion boxes.

If you queue next to a retainer bell and shove the items on them between runs, you're looking at approximately 83,850 seals per hour.