@Roger *******
if it's only $14, you are beating onward travel suppliers where you rent the ticket.
And for Jan's (and your) peace of mind: airlines know that not everyone will show up, especially if tickets were sold at such rates. That's why planes are sometimes overbooked. But it would be fair to say that the whole scene with unnecessary onward tickets does make it harder to predict how many people will actually come, which does indeed lead to more empty seats.