It depends on the quality of the course and how close it aligns with my goals. Ex: Udacity's SDC Nanodegree amounts to $2400, but was worth every penny for me.

It depends on the quality of the course and how close it aligns with my goals. Ex: Udacity's SDC Nanodegree amounts to $2400, but was worth every penny for me. On the other hand, there are numerous machine learning courses on Udemy, and most of them I wouldn't pay for at all (even at $5-$10). In the latter case, most of the content is either non valuable (its stuff that's repeated all over the internet) or non practical (can talk a lot about theory or math but if I don't actually build anything it doesn't help me).