How many in-housers are leaving vacation days on the table each year? Besides the economic aspects, taking time off can be good for your health:
“It feels good to be productive and become a super worker, but time off is important for keeping up your happiness and avoiding burnout. If you’re a salaried employee that gets paid vacation, however, it’s even more important because not taking it is the same as doing work for free.”
Read: Not Taking Time Off is Like Getting a Pay Cut (If you Get Paid Vacation) at Lifehacker.