Why not?
They have warbands to give them fast, free skilling xp so whats wrong with a daily fast huge chunk of combat xp? Wbs has helped those who don't love skilling max so why not skillbands for people like me who would like to max too?
I know people who hate skills like farming, etc that now have way more xp than me in the skills just because of a few minutes of wbs a day.