That parable basically describes how our world works.
People who are "old" in the industry are the ones who are typically earning more money and probably rich. Gained through many years of hard work, more opportunities, etc.
On the other hand, those who are just starting out would probably just get little jobs, small salary, probably won't even be able to afford a decent apartment on their little income.
That is how our world works.... Notice the Kingdom of God doesn't work that way... Because our ways are not totally justified. Not everyone who works long enough gets to live a good life, ends up with high income. Because the world uses a different standard than God. A standard that cannot guarantee the same opportunities for everyone, no matter how hard and well you work.