Because of the terms of my policy, it covered me if I could not work as a doctor, but I could have other income. And I could still earn up to 20% of my base income as a doctor before they started to prorate my payout. So, if I earned 50% of my baseline income as a doctor during my disability, then they would still pay 50% of the benefits. But if I earned 50% selling car parts through my SubaruPlanet.com website it did not affect my payout (I got too sick to run the site in 2004 and gave it away after a failed sale).
When I shut down my medical practice in 1999 I went to work 2-days a week part-time in the next town over, at another medical practice, seeing my chronic and complicated diagnosis patients with diagnosis like ADHD, cystic fibrosis, diabetics, seizure disorder, birth and heart defects - kids that could not get by with the family practice docs in the small town I had been working. I earned less than the 20% as a doctor while I worked part-time until 2007, when I could not do it anymore. In 2008 I was awarded social security disability, and I still collect my private disability.
I guess I got lucky, combined with selecting the right terms for my disability policy. After 65 I will still have my Social Security, and my wife will have her pension; but the house will be paid off, the kids will be off the payroll, and we should be fine. I wont be buying watches or guns or knives or more audiophile equipment, so that we can afford to keep a nice car and maybe buy a trailer to travel around the country if we downsize the house (we wont need 5 bdrm, 5 bath).