That's the rub, all right. The fastest source of soldiery also happens to be the fastest source of Myth - and for anyone who's capped soldiery for the week, it's pretty much a complete waste of time to do the final third of the dungeon.

That said, folks who drop without a word are pretty rare, at least in my experience. I only had someone drop after the second boss one time - and that was on a Lost City of Amdapor run (same rewards, much less speedy). Most folks who actually want to spam the first two bosses join one of the many, many party finder groups that spring up all the time to do just that (or form one of their own).