Quote from JSL_Capital:
Deep in the money calls behave pretty much like the underlying but require less margin so I'd think people who want the leverage on the long side would buy them rather than stocks.
It is indeed a little weird, as I think about it, beccause selling these are pretty much like going naked short on the underlying, unless of course, it is hedged.
You can go deep in the money for a lot less than $78000 per contract.