Ive gotten to know several doms personally over the years. Id say the majority were grad students and being a pro domme offered good income and flexibility. A fair amount used domination as their main income and did pretty well especially in the last few years. I know a few did gig jobs like artwork and modeling to supplement as well. The smallest minority had a vanilla job.

I dont session much anymore but do stay in casual contact. One Dom i know who is very under the radar is a registered nurse. She recently went back to nursing and cut some pro domme work because contract nursing money is so good.