Yeh that's why I said ~15-20% - it varies with IV, I just take a different spread than exactly +/- 20%. Fundamentally I don't want to be exposed to black swan downside, and black swan upside is statistically rare - so I don't mind losing that (things don't move up 30-40% in a month too often - manias/booms are slow - but they have moved down 30-40% crashes/panics -> bull markets are slow, bear markets are fast - and that is the asymmetry I'm exploiting to cap my risk without negatively effecting my return - selling covered calls is effectively free money most of the time, and buying puts covers my ass from Enron like events and the asymmetrical movement between booms/busts/disclosure negative information like bankruptcy).