I feel like I can comment on this. When I was in high school in the late 80s I started dealing pot, acid, mushrooms, and speed. I only did it for ~2 years, but when I stopped I was making about $40k/year. This was more than my parents (an accountant and a RN) individually made; I think they were both making ~$30-35k/year. Google tells me that in current dollars, this is about $75k per year; a pretty good take for a 17 year old without a high school degree.
Most of my money was made selling acid which I could get in hundred lots for ~ $0.70 per hit and easily sell for $5. I would sell 100-200 hits a week without breaking a sweat going to concerts in Denver and cruising Colfax or going to the hogback (if there are any Colorado natives on, they should know about this). I would buy pot for ~$250 / 1/4 lb and sell it in quarter ounce quantities at a 100% markup in a week. I would also sell mushrooms and speed (like the really crappy stuff), but this was really not my thing. I made $3500-4000 a month easily; I was raking it in.
Of course it was awful, damaging in more ways than I can enumerate. Took me years and lots of therapy to get over it an become a normal person. I stopped because I got caught by the police twice in a month at my high school with pot on me. They were totally on to me and were focused on shutting me down. The first time I got caught, the officer (Polka was his name, though I don’t know how it was spelled) took the quarter or half ounce I had with me an threw it in the river (he caught me in a park). He lectured me and scared the shit out of me and told me to straighten up. The second time, about a month later, they took me down to the jail in downtown Denver (at 13th and Cherokee) and booked me. My parents refused to bail me out for ~16 hours or so and left me there until morning. I don’t remember all the details, but I made a deal that if I did not get in trouble for 5(?) years it would be expunged from my record. I assume it was.
I went straight after this event, graduated, went to college, worked, then grad school, eventually got married and had kids, and now work as a scientist at a local state university. Still in Colorado. In adjusted dollars, I make about double now in my 50s what I made then at 16/17 years old.
The crimes I committed were damaging to me. Psychologically. Socially. Maybe financially; hard to be sure about this. I regret it and am ashamed of it still, even though I came out pretty much unscathed. That said, I still understand the why of it. I was well off. I felt independent from my parents. More successful than my peers. I bought a car, moved out and got an apartment, and basically became an adult years before anybody else I knew my age. It was terrible, but also awesome.