With the new KMS updates

Uh, I don't see how avoiding attacks makes their DPS go up that much. A corsair can just use rapid fire and get healed from a priest and still outdamage demo.

If you hadn't noticed, getting hit by attacks kind of disrupts you. Demo spamming (which allows you to avoid getting hit) lets you spam it endlessly during the transform time -and only during that time, yes i know- while corsairs stumble slightly from getting hit.

Think of rapid fire like hurricane. Any BM will tell you that getting hit while using hurricane (while not necessarily annoying) still slows it down a bit. Especially if you're constantly getting hit. Each time you have to go through the start up time of the first hit instead of getting a steady stream of arrows... or bullets in the case of rapid fire.