So you ask why do people meditate. I think here's why:
When you want to get stronger, you workout with weights. However the most powerful organ in your body is your mind. Meditating is like working out with your mind, because you're constantly trying to focus it on what you want. When you meditate, in the end, you have a mind that can control instead of allowing it to control you. The fruits of meditation is that you now have better control of the strongest organ in your body.