I got robbed on option expiration Friday!! (option ex pinning)

Quote from sub0:
I bought some BAC puts betting on them missing earnings.

All I know is I'm a licensed market maker


Getting back to first principles, if your business actually is marketmaking, wtf are you doing "betting" on "BAC missing earnings"? Why would your guess as to BAC's earnings be any less of a cointoss than that of the guy on the next barstool?
 
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