It probably rains diamonds on Jupiter.
No one has ever gone out there to check it out and confirm, but all the conditions are right for a never-ending Zales shower just outside of humanity's reach. Infinite wealth is just a six-year spaceship journey away!
Our solar system's gas giants are sexiest beasts in the galaxy. It's fun to think about but...Jupiter? We've never even been to Mars, which would take less than a year to get to. There are more accessible options for our precious resources.
And besides, by the time all of that planning is completed we would be looking at six years of space travel in each direction.