Skew modality flips at the equity peak -: sstrike downside; sdelta upside. Puts are the revenue-side of the risk-reversal as singles, but call spreads are the revenue-side when trading verts. Think about it.
How do these exist? Like even lacking any clue about options math or dynamics, isn’t it trivial to brute-force scan the entire listed options space for combos with a PnL graph like this?
It's complex to model. A threshold needs to be hit on 1st to 2nd decile vols and/or switch values (vol-backwardation).
Switch Lock -> D1/D1 backwardation (duration) -> $0 margin under PM (credit req/adds like a short box cr >strikes) You can see that I am not stressing vol.
Tails maintain convexity from 0-inf. Small haircut ($3K debit). Crazy rho on long-dated but that is simply opportunity cost (moot) and this is a 2W combo. Allows you to trade short-gamma locally with no bear-risk. Bear tail is conservative due to vol-corr and upside due to stickiness, but I typically model a touch of the the bear trough to x as vol-corr (- to index) will shift the curve higher. It's an ideal portfolio prot. I arb VX against it (long switch say Dec/Jan for convergence gains as SPX/cash convexity exceeds leverage to VX). IOW, you can arb the long switch in VX against VIX SOQ.