Good point! But still, in the last 20 years the market went through 2 big crises and strong bull periods... of course is not final answer, but to me is kinda significant :)
Except for the fact that IMO disclousre is important, even if sometimes it can be painful, it's still the best way to get vulnerabilities fixed make the Internet a little bit safer.
Next time you find a 0day, try OpenCIRT. We can't guarantee anything but we are putting lots of efforts in designing strong procedures for effective disclosure.