2016 Expedia Vacation Deprivation Survey: Strange and Misleading

The presentation of the 2016 Expedia deprivation Survey is here. The headline is: Work-Life Imbalance: Expedia’s 2016 Vacation Deprivation Study Shows Americans Leave Hundreds of Millions of Paid Vacation Days Unused. The study claims:  Americans received 15 paid vacation days from their employers in the past year, and took only 12. With three days unused, this means American workers effectively failed to take approximately 375 million paid vacation days within the past year. What about the millions of american workers who don't receive any paid vacation? They don't seem to appear in the survey. They certainly would like to take vacation if they could afford it but they seem invisible to Expedia. Reading the survey's analysis one has the impression many Americans choose to take less paid vacation than they have. How misleading is that when so many don't have any paid vacation at all! Though many American companies indeed 'gift' their workers between five and 15 salaried days off per year, the most recent study (2014) from the US-based Center for Economic and Policy Research found that nearly one in four private-sector workers doesn’t receive any paid vacation time.  That's what has to change and it is somewhat intriguing, even shocking that Expedia does not point this out. Why? obviously if millions of workers were getting paid vacation that would be good for Expedia's business?