The Bible verse for today starts with the word "Blessed." This is another word for "happy." I have no idea how many people in these stores actually go to church, or are saved, but I strongly believe there is a correlation between being happy and worshiping the Lord.
David, by experience, knew that being around God and the people of God in regular worship leads to a joyous heart. Of course, this assumes that the individual is willing to forsake sin and to worship God from the heart.
Learn more by going to The Power of Regular Worship.