Some thoughts on taking risk when investing in startups:
VCs pick the "wrong" companies most of the time. In most professions, this would not be ok. If you are a brain surgeon, you cannot mess up 90% of the time. If you are a civil engineer, 90% of your buildings cannot fall apart.
In other professions, you hit a binary outcome w/ your work. The job was done right or wrong. As a result, in other professions, you cannot afford to mess up a lot since your outcome is capped. In VC, your upside is uncapped.