They're fairly easy to solo once you get in the groove for it in a certain area. Spam an aoe, circle of scorn, flash, w/e and you'll get gold every time (non boss/gather fates anyroad). Sometimes you may need to be one step ahead of the herd and run to the next fate before the last one is over.

Now, what I really want to see is a miniaturized version of the fate completion bar on the map. Knowing when it started doesn't matter when they can end in 30 seconds, then an hour later when less people are on they can go down the 8 mins left and still not have anyone there.