Very good question. And since we are talking abound CDS (?) or similar “insurance” derivatives, here is a wider one:
Suppose there was about $11T-$14T in total mortgage market - that’s subprime (less than $1.5T) plus Alt-A plus prime, all. Some put the total securitized market (MBS / CDO) at $7T-$8T. Suppose there was about $60+T of “insurance” (CDS) on it. That starts to look like a “house” that has been a “wee bit” overinsured.
For comparison, the total loss in recent “stock market” value was about 40% or $8T.
abound = about
Couple that circumstance with FASB 157, 20 years of “moral hazard”, and the likes of Barney Frank, Chris Dodd and friends, and you have a perfect storm.