Well, my motivation is that I have chronic migraines. I have been using prescription migraine medicine for a few years when I realized they were only helping the symptoms. I am hoping to cleanse my body of toxins and reduce the frequency/severity of my headaches.
My husband's motivation is that he is constantly getting parasites. He has a weak gut due to years of an undiagnosed dairy allergy - and just can't fight off the little buggars very well!
My dad is going to do it because he is diabetic and overweight.
My step-mom is going to do it because her dad died of a bowel obstruction a couple of years ago and it's a very bad way to go. She wants to make sure she doesn't get the same condition.
I haven't started yet because I have weddings and parties to go to this week, but I am starting right after that! Please post how you are feeling and what day you are on. Thanks and good luck!!

I am doing it to alleviate a variety of different chronic illnesses and symptoms, among them:

Depression
Thyroid Disorder
Insulin Resistance
Overweight
Acne
Fatigue
Back pain
Constipation

I did the mastercleanse for 17 days early in the Fall and it made a major difference in my health. I am doing it again now and probably will do it again in the Spring as well.

I also have chronic health problems (although not severe, at least at this point).
Depression
Allergies
Alcoholism
Hypoglycema
Fatigue
Anxiety
I have received help for all of these from the medical profession. I have experienced marginal to moderate relief from symptoms using medical practices. However, I feel drawn to a more holistic way to care for my body and to "cure" these conditions. I don't know if "cure" is possible, but cleansing/fasting cannot do more harm than medial practices!