Let them know precisely what you are going to do with their data
Everything is important- that success is in the details.
Ask for feedback from people with diverse backgrounds. Each one will tell you one useful thing. If you're at the top of the chain, sometimes people won't give you honest feedback because they're afraid. In this case, disguise yourself, or get feedback from other sources.
I don't view wealth as something that validates my intelligence.
Things don't have to change the world to be important.
Pixar is seen by a lot of folks as an overnight success, but if you really look closely, most overnight successes took a long time.