Why do hostels expect people to work for free?

Why do a lot of hostels expect people to work hard for free?

I have travelled a lot in my time and stayed mostly in hostels as well as working in hostels too.

Are hostels not businesses that make money the same as other businesses?

So why do a lot of theses hostels not pay their staff?I am traveling around Europe and beyond and like working in hostels

HOSTEL NAME

OPPORTUNITIES AVAILABLE

HOSTEL LOCATION

Job first posted: 11 November 2013