To achieve 15% raid attendance you would need to attend 31 out of the last 203 raids (based on the last 30 days).
I have been in <Awakened> for almost 3 months and have already bought 3 Best in slot (Tunare belt wuwu) and 6 other items I have had my eyes on for a long time. This is not including a primal! Our DKP has served me and many others very well.
I work 40-60 hours a week and otherwise I raid and track when it is convenient for me.