...cause as we all know, the bad guys would never have any money to buy these or have false identities/shell companies with stolen information to purchase vulns with. and $10k? I bet some of the larger spam ops pull that in about an hour.
Here is a question, what if a windows vuln was purchased by bad guys, using fraudulent info and a stolen credit card, and the purchased vuln was then used to exploit windows users and steal more creit card numbers? Like a snake eating itself.
I personally think making vulns a commodity only creates a more harmful environment. Only crappy security vendors buy these and then write signatures to catch one variant of the exploit. What a world.