You, the new car buyer, enter the showroom. One one side is the group, kicking the coffee pot and looking grumpy. Across the room is John, bouncing around happy as can be. Now, let me ask you the critical question. John, of course.
Positive energy attracts people to it.
The bonus is that this activity is cumulative. The more you do it, the better you feel. All you need to do is look at the sales figures for these companies to see the results of these programs.