The income is most assuredly not okay in residency, or for that matter, fellowship. Most U.S. residencies and fellowships range from $60-$70K a year, basically the U.S. median income, and on a per hour basis is terrible.
All the while spending 60-80 hours a week on clinical service and 5-10 hours on research and education so you can maybe get a job somewhere not remote when you're done.