Grinder,
Those OTM wings are long (bought), not sold, which does not increase the margin requirements. In fact, it should reduce them compared to straddles. They also give a possibility of profiting in the event of a black swan, or in the unlikely event of a "melt up" (or whatever you might call a sudden dramatic rise).
Of course, 90% of the time the wings will expire worthless and cut into the profits, but........ in the 10% case, they'd come in mighty handy.