1. You can largely take care of your patient's problems in the 20 mins you have them in your chair.
2. They generally come to see you and leave "in a good mood".
3. You can develop a rapport with them, just through chatting.
4. If you care about the patients, they will notice it, and it's a good feeling to do things the right way.
5. If you aren't a business owner, it's a nice lifestyle (you can leave your work at work).