Quote from FrankSlaughtery:
selling vol/cds/puts/whatever is NOT free money
if it was it would've been arbed a long time ago. pls don't be like Victor Niederhoffer who made money for years selling index puts then blew up in a week. if the notional on a cds car is $10m and you only take in $50-100k for selling protection, you can hopefully imagine what happens to you in the event something unexpected happens.
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Right. CDS are institutional instruments, but even if hypothetically you can implement the trade and collect the premiums, you make money 99% of the time, but that 1% the time you're wrong you completely wipe out your net worth and then some.
Think about AIG who sold cheap CDS on subprime debt to John Paulson.