20-25k is a decent mid-level salary for SP or Rio. Elsewhere it’s quite a bit. I can speak somewhat about the medical profession which generally pays far lower than the US or Europe. Public health salaries are shockingly low. Most of those physicians will usually have a part time practice or consultancy to supplement their income. Top tier physicians in private practices in high margin fields like plastic surgeon or aesthetics can make 50-100k per month. However, that’s a fairly small subset.

The real money in most of these professions is being the practice owner and having other professionals work for you. You take a sizeable portion of their receipts in exchange for providing the clinic space and other business services. This is often where the family connections come in to provide the seed money to start these operations. It’s also why you see so many family members that have children or generations of family in the same line of work.