Wilco:
A sustained state of arousal, attention and vigilance is not healthy in the long run (stress, cardiovascular damage). Sustained high neural activity is linked to arousal and attention. We tend to avoid such states due to health reasons. (A complete lack of arousal can be bad too, but that's a different part of the story).

As often in nature we find pleasant what is helpful for us (sex, eating). We seek good stimulation without being consciously aware that we do. Nobody can feel the activity of the hair cells. We react on a different level and seek what is pleasant to us.

Wolfgang