Trust is always important in business, but in the sharing economy, it’s the beginning, middle and end of the story. “For many people, their boat is their baby, and we know that,” says Adrian Gradinaru, co-founder of New York City-based boat rental marketplace Sailo. Through Sailo, people can rent from anyone who lists their boat on the site and can also hire a licensed captain to charter it. The company’s listings are mainly in South…