Not quite. The goal IS 100. You will be able to complete the quest that way for "standard pay" of shards.
Hit 200 or 300, and you get a "bonus" payment.
Mind you, people are treating it like the optional 10% XP for not dying. It isn't a requirement even though people are treating it as such.
I've seen it on occasion actually. But normally it isn't enough to really worry about. It becomes a lot more prevalent if mobs start to fear them so they bunch up.