Because that will make the people who listen to a testimonial. Feel good, make them happy, make him feel this person sincere with them and they will be more attention and love us.
It makes people feel good to hear compliments, making them happy. He felt that this person is going with them. And they are increasingly turning their attention to us and love us.
Because makes people received listen to admire, feel better, make them happy, make him feel that this person sincerely with them. And they have turned their attention to us more and more, and love.