I'm obviously not the OP and am but a humble med student but I have a family friend in GI who's racking up the dough. Works private practice in New York City, makes more than 700k every year...his boss/original owner of the practice gave him a Mercedes as a congratulations gift when he made partner. That said, he advises me against GI and against medicine in general (I think this is more because private practice in general is not as satisfactory as it was when he started in the 90s).
OP, I do have a question. I find GI really interesting from a research/physiological perspective. Of all the systems we've done so far, GI seems most interesting. Really not interested in procedures, though. Really enjoy the history taking, "80% of your diagnosis should come from the history and physical exam" aspect of medicine (which I feel like most specialties seem not to do). You said there's a lot of flexibility in GI, but would I be able to ultimately find a job that honors my interests? Also want a fairly laid-back life. Also, in terms of all of the cool immunological research going on in GI, plus gut-brain, gut microbiome, etc research, do you feel like you're able to clinically do much with that stuff yet or do you forsee being able to do so in the future?