I believe the ones that don’t make it in the industry (if they chose a good one) don’t give it enough time (like you said they quit before a year is up) and commitment to doing what it takes to grow. I don’t spam FB and only 2 family members order product but I have at least 100+ home school moms making >$2000/mth. Some team members make more, some less. It’s what they put into it (business wise not monetary)
In order to be successful at any business, you need strong support and solid training. The law requires MLM companies give you a slew of information, including financial details about average income. Study this and ask questions. If the rep is hesitant to answer or glosses over your concerns, he's not someone to work with. A legitimate MLM company wants you to be informed
Many MLM companies recommend starting with a list of 100 people you know, called your warm market. Although it's not a bad place to start when looking for customers and business builders, the technique could also backfire and get to the point where you're annoying friends and family. You're better off spending your time finding people who are interested in what you've got rather than trying to convince your commuting buddy to sign up when he doesn't want to.
MLM has stretched its sticky fingers out into just about every product market out there, so it’s kinda hard to do something new nowadays. But Jamberry Nails did it. Their adhesive, custom nail designs BLEW UP when they hit the direct sales floor. They built up an army of over 100,000 consultants in the time it takes most people to get a mediocre pay raise at their 9-5.