Because there is so much more money in the “ordinary workers and students” subset of society than there is in the top 0.x%.
FWIW, in 2011 the top 0.01% earned 5% of national income, the top 0.1% earned 10%, and the top 1% earned 20%. Source: http://ritholtz.com/2011/10/forget-the-top-1-look-at-the-top...
In 2016 the top 25% earned 51% of national income. Source: https://www.statista.com/statistics/203247/shares-of-househo...