Quote from rocky_raccoon:
Can you come up with a realistic scenario under which SVXY drops to zero?
What VIX futures would look like in that case and what would happen to ZIV, XIV, VXX, and VXZ?
Quote from bologeorge:
In 2008, vix jumped from 19 to nearly 80 within few weeks. That's a -300% move for short vix futures positions. Of course the futures price will be in backwardation, but still...You can figure it yourself. A 100% rise for vix means a 50% drop for svxy.
XIV is the same thing as SVXY. You can compares these two and will find them exactly the same. VXX is just the opposite. VXZ and ZIV are opposite to each other. They track the mid-term vix futures. They move with vix but with less percentage.
Quote from rocky_raccoon:
So, that would mean SVXY or XIV would drop 80% or so. Bad enough but not zero. For XIV it would mean a fund termination as they have a built in stop-loss at 80% decline. SVXY does not have that feature.
Here is a simulation of XIV since 2004:
http://investing.kuchita.com/wp-content/uploads/2012/06/XIV-Historical-Data1.png
The drop in 2008 would've been close to 90%
On the other hand, here is a long VXX/long XIV pair performance that seems to be doing well in any market:
http://dontfearthebear.com/2013/03/01/a-few-notes-on-xiv-vxx-pair-trades/
Quote from bologeorge:
Thank you for providing such important information. Which software/database did you use to make that chart? I tried to calculate the price of vxx before its existence but didn't get correctly.
The XIV/VXX pair trade seems to perform well. But there might be a problem: the vxx declines in most time, and its shares and price will be re-calculate after a period. So the hedge ratio will be a big problem.

Unless I'm confused, it seems like you're ignoring the cost of buying back SVXY shares (at higher prices) after they're called away.
For instance if SVXY is $10 and calls are $1, then in 3 months it rallies to $15, you receive $1 but lose $5 on the called stock (you have to re-buy it at $15 in order to sell the next batch of calls).
Quote from Maverick74:
I think this thing could trade down to the single digits. Which means you have to sell so little size that I don't see how it how it could be worth it. Man this bull market is getting long in the tooth when I read posts like this. The time to sell puts is right AFTER the crash, not 4 years into the bounce.