Quote from syswizard:
2) if the price does not move, the option position still shows a profit
If your delta dwarfs your theta risk then that is not at all a realistic scenario.
Look at how spreads would do today. You'd be looking at massive deltarelated losses. I was short the Jan31 ATM vol and took a 0.5pts hit, and stickiness worked in my favor. If I was short the spread I would be in much, much more trouble. Again, why trade spreads for theta when there are much better, lower risk structures for it? In fact if anything, I would be buying spreads (paying debit) because there would be an awesome RR to hedge with. Look at notional risk and then give me the yearly return for a spread.