How should it be ?
When you want to ask about an object for example:
Many people like good cars.
What cars do many people like?
So the question form is
what + object + do/does + subject + verb + the rest of the sentence.
And I was wondering why we ask:
A big house costs milions!
What house costs milions. (or maybe correct is what house does cost milions - according to the form above.)
Can someone explain it to me?