Wrote a basic strategy to sell call spreads and put spreads on various index ETFs. I only sell near-dated stuff <1 week expirations to avoid paying too much theta. A fairly consistent trading strategy can easily gross >50% returns on your capital. Not exactly "passive" - but with enough tweaks to the strategy you can get this to run with fairly minimal input time.
What platform do you use to automate the trading? I was always surprised that innovative companies like Interactive Brokers never invested in a simple to use scripting language that would allow people to try out ideas out in the markets.
