It's just fun, and it costs less arrows maybe. In TOH where weight is limited, this could matter. In other places where its less important, I'd be disadvantaged.
As I said, I'm not looking to get necessarily the best build, I like to design my own. For example, crit sin used to suck so badly it wasn't funny. Knights and Hunters and Blacksmith all had unique advantages over it, and barely any disadvantage (because the dps difference between low dmg crit and high dmg not crit was in favor of 'not crit' except against very high def mobs like Stalactic Golem).
It's still the build I favored, double-dagger outdamaged me almost 2 for 1, I didn't care.
Now with elemental slotted katars and sinx having adv katar mastery, its somewhat better, the 5 more agi bonus also helps. Still inferior to double dagger depending on mobs (except against high def, or when crit lock is necessary).
Eventually, the way things look, critical looks to be highly boosted, and double-dagger highly nerfed in Renewal. Not something I expected at all, but welcomed nonetheless. Can't say I'm an opportunist as I've done this kind of build for 6 years. I'm speaking of Assassin, my Hunter experience is pretty small so far.
Little Sara 87/50 Assassin
PM me if you want to contact me, will more likely be replying than in-game (not always on Assassin).