Why do you think people enjoy dangerous sports?
Adrenaline.It is a hormone that occurs in stress situations. It is the cause that your heart beat faster, that your mind think faster and that you want to shout because of the emotion.
Ordinary life can become boring and routine. Dangerous sports break that routine and give you emotion and excitation. At the beginning maybe you feel scared, but then you feel a sensation very similar to hapiness.
That is why people love dangerous sports, they give them emotion to theirs lifes.