Flames lose a ton on Primal, so I have a lot of experience with this bonus. lol I've gone on a losing streak of 12+ matches in a row at times. At least this last week, we were actually doing pretty good.

This bonus was added in some hotfix patch if I remember correctly, sometime soon after Frontline was added. Other than that, I actually got the info just from doing a lot of FL and losing a ton. :P