You set a target in your life. (That usually happens when you are in high school or earlier. The earlier the better.)
If you are smart, the target should be achievable.
Most people with average intelligence usually reach their goals in life. (Making decent money, having a decent salary job, wife&kids, a yacht etc)
If you are smarter, you achieve your target faster than the others. A lot faster. That makes the real difference. I am not that smart but I can identify a smart guy instantly. Most people don't have that talent. :p
Speaking as a boat owner, a yacht is not an intelligent life goal.
Depends.
Depends on what problems you are experiencing as a yacht owner. Maybe you shouldn't own a yacht. Without having enough budget and knowledge, having a yacht might become your nightmare and that's when you realize you didn't make an intelligent decision by buying a yacht. Maybe a 45feet long boat isn't for you but only a 32 feet. Maybe you didn't like sailboats. Maybe you are a motorboat guy. Maybe you don't like to hold the wheel, maybe you want a captain on a pay roll. Maybe you don't want to deal with the repairs, maybe you don't have the money to have someone to deal with this shit.
Depends on a lot. Intelligence bruh. You gotta know what is going to make you happy.