There's no need to have a huge income to live a happy life. F*ck you money is whatever amount of money needed to live the lifestyle you want. By lowering the income required in your life will get you closer to f*ck you money and be able to pick the people you want around you, the job that pleases you the most, etc,... requiring a lot of money might no be the best strategy to get there, it will require you a higher salary.
Most of the times we have more control over our expenses than our income. We need to be smart about how we spend.