There are many people who come from very wealthy families who are in this profession. Obviously, money is no issue for them and they become pilots because they love the job. Having said that, if you are really a radiologist and want to become an airline pilot then go for it. Worse case scenario you will lose a few million from lost income as a radiologist and will return to practicing medicine. Best case scenario, you will love the pilot job, do well and maybe just practice medicine one or two days a month just to stay current. I have many doctors in the family and they tend to like their jobs. They also say that flying for a living is a tough way to live but what do they know, they're not living the piloting life.