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Re:Hacking Team: a zero-day market case study by FireBeyond on Sunday July 26, 2015 @06:52PM (#9952484)
Seems to me you could "quite easily" double dip.

Sell your exploit on the black market. A day later, sell it to the vendor. "Sorry, they must have found and patched it"? Just ask Facebook not to disclose your information when highlighting vulnerability payouts.

Re:Hacking Team: a zero-day market case study by tptacek on Monday July 27, 2015 @12:01AM (#9953248)
If you read this whole post, you'll see that buyers expect this behavior, and payments are escrowed or tranched to account for ti.