For anyone interested, I'm also a Udemy instructor of a best selling course with 13K students.
My course is priced at $54.99 and I've made $44,000 from the course in total. So that comes to about $3.50 per student.
To be fair a good chunk of the money I make is from their Udemy for Business program.
The results aren't the best, but I do appreciate being able to make money with zero effort in marketing on my end.
That being said, I'm working on a new course. This time I'm building out my own platform - which will actually be a 100x better experience for students, and I'll be sure to do my own marketing this time round.