The psalmist concludes that a good life has not brought him wealth or freedom from troubles and therefore has been "in vain". But this unmasks his heart. His obedience was not a way of pleasing God but rather a means of getting God to please him. When you say to God "I'll serve you only when a certain set of circumstances appear," then it is the circumstances we love and God is just a necessary apparatus for obtaining it. "Seek ye first the Kingdom of God" means just what it says. Your interpretation or the inconvenience of the moment are not relevant.