My main reason for doing balance poses nearly every day is the great calm I feel when breathing deeply and holding stable on one leg in a variety of positions which make that challenging. The balance portion of my practice usually lasts 10 minutes or so. I try to hold for 12 to 15 breaths on each leg in each pose.
I also like it because of where I put my gaze. Yoga teachers advise us to focus on something that isn't moving. I gaze out my front window at either Bonticou Crag or Skytops -- two well known features on the Shawangunk Ridge
Geologists say neither has moved in 270 million years.