Some months it will be opposite, with the product sales bringing in the majority of the income. It all depends on what I am working on, of course.
I’ll start with an affiliate program that I dont actively promote. Its a passive-earner. The way that I promote the program is through one web page. That page ranks well in the major search engines for a variety of keyword phrases related to the product I promote there.
I cant remember exactly when I put that web page online, but I believe it was around 2 years ago. It has been a consistent earner ever since, earning on average around $10/day.
those interested. Its been a long time in development, but there were some major changes since I first started writing it, so I have it on the back burner for a major re-write. You can  if you want to get notification when it’s released.