A professional investor would be more angry with you if you took $1mm, promised you were going to make a high-risk higher-reward investment, but then secretly invested it in something safe, returning him 150% of the original amount in ~5 years, instead of taking a 1% chance at $10k.

This is why you take investment from professional investors on open and honest terms, not from people like "friends and family" who feel pressured to do so and may not be in a good position to accept the risk.