What is the passage mainly about?

We represent a surprisingly potent threat to our own leisure time. Even the U. S. Travel Association has a vacation problem. In 2013 the company saw just 19% of its employees use all their time off. They joined the millions of American workers with access to paid time off who left 429 million vacation days on the table.
   While some employers allow workers to bank their time off from year to year, or to receive payouts for the time off upon termination, a whopping 169 million vacation days came from "use it or lose it" policies and vanished into the ether. Americans essentially did $ 52. 4 billion worth of work that year for free.
   We have good excuses. Money is one. In tight times, leisure can be the first thing to go — hence the "staycation" or three-day weekend where once a full week’s trip would have been. A mix of fear and dedication is another excuse. "Too much work to do" was the most popular explanation for not taking all allotted vacation days, cited by 40% of respondents. Some people claim not to want a break: nearly 20% said they just didn’t need the days, and almost as many workers suggested simply, "I enjoy my job. "