For the same reason a host is entitled to prior disclosure of its unfixed vulnerabilities.
Selling vulnerabilities on an open market should be outlawed. Either disclose them publicly for free, or participate in a bounty program by the software owner. People selling undisclosed vulnerabilities should be considered accomplice of people who then use it to break into systems.
Selling vulnerabilities on an open market should be outlawed. Either disclose them publicly for free, or participate in a bounty program by the software owner. People selling undisclosed vulnerabilities should be considered accomplice of people who then use it to break into systems.