Well, having a high educational attainment doesn't guarantee wealth, BUT, it could give you a better opportunity than those who did not finish college.
However, life is a continuous learning, if a non graduate decided to learn everything outside the school and continue learning consistently, he'd most likely going to succeed than those graduates who become complacent of the current job they are in.
Nowadays, there are a lot of gigs and niche online that would let you earn at the comfort of your home and sometimes, a 4 year degree may not be necessary as long as your skills are competitive enough to compete in the growing industry.
I've known a lot of people who hasn't finished college, but are earning more than those graduates who works for the government.
Education is just really a piece of paper if you stop learning after graduation. Mastering and enhancing your degree will give you more edges against the other competitors in the same field of interest.