I disagree that the money is a problem.
I think you should list it, but whether you place it in “hobby” or “employment” is up to you.
I think saying this looks bad because it “looks like you’re in it for the money” is akin to looking at an engineer and saying they didn’t go teach math instead because they’re in it for the money.
Come now. You’re allowed to make money. Frankly, assuming OP doesn’t see being a doctor as a cash cow, it should be very apparent that the primary motivation for becoming a doctor is not, in fact, money, in essays.
No matter who you are, money ranks somewhere in the decision list to become a doctor. It’s probably not very high, but it’s there. I wholly think anyone who says otherwise is lying or in denial. Would you still be a doctor if instead of 300k your job prospects were 50k (and your debt remains the same)? How about 25k? Everyone has a price, and it’s disingenuous in my opinion to act as if medicine is independent of money.