The 32-year-old brings in $39,000 a month to rent his 2 boats to strangers—and only works 30 minutes a day.

JP Mancini II has always been attracted to luxury. He just thinks the bar of entry is too high. Then, last January, he decided to pay off his $400,000 boat. Renting the 37-foot boat, docked in Key West, Florida, on a rental property called Boatsetter, he booked 11 trips a month. The next month, that … Read more