Sorry, are you saying the net worth you put into the calculator was more than $250k? Then $70k is even less surprising!
(If colleges ignored home values you could put your $250k into repaying your mortgage faster and report having no savings. They'd charge you $0. And if you needed money later you could borrow against the value of the house.)
It's completely reasonable for you to decide that "everything I have" is not a reasonable price to pay for college. What I'm getting at, is that these colleges are very careful not to charge you more than it is possible for you to pay. They are extremely good at price discrimination.
Sorry, are you saying the net worth you put into the calculator was more than $250k? Then $70k is even less surprising!
(If colleges ignored home values you could put your $250k into repaying your mortgage faster and report having no savings. They'd charge you $0. And if you needed money later you could borrow against the value of the house.)