Not trying to argue with you, I am mom and pop retail, but I always wonder, most corrections are short live, usually bounced back and then some, if you do a Martingale, doubling down, you will be back?
We camped for a few days at SPX 2850, with vol at more of those "historic lows".... Let's be bold and just assume you were 40 points out, at 2810, and that you doubled/rolled when the market got within 10 points (initially, 2820) of your position. (This idea ignores the idea of rolling out in time, but the benefits of that roll diminish in a ~5 weeks anyway.)
So! You're at 2810, market goes to 2820, you roll&double to 40pts lower, at 2770.
Market hits 2780, you roll&double another 40pts to 2730.
Market hits 2740, you roll&double to 2690.
Market hits 2700, you roll&double to 2650.
Market hits 2660, you roll&double to 2610.
Market hits 2620, you roll&double to 2570.
Market hits 2580, you roll&double to 2530.
Market hits 2540 (this is now February 9th), you roll&double to 2490.
If you were initially working $1,000 of capital, you have now doubled eight times.
That's $1,000 x2, x2, x2, x2, x2, x2, x2, x2.
"2^^8" == 256 times.
You're now kissing a quarter-Mil, not counting thousands in commissions (no matter *who* your broker is...).....
These are very rough numbers, and do not take into account the vacuities of volatility, mud-bound frightened-ass markets, any roll-outs in time, or any split/rolls that use the other (call) side of the market (which could well set you up for being Whip-sawed).
Bottom line?
Rolls are two trades, not a modification of a single trade.
The first trade is the recognition that the initial position has failed.
The second is a brand-new trade, and needs to be based always on the same sorts of criteria as any other initial trade. That may *look* like a Martingale, or it may look like something else.