A wild guess is 3:1 (3 working 0-day exploits in existence for every 1 found with exercises like this). My reasoning is because every time there is a very high-

A wild guess is 3:1 (3 working 0-day exploits in existence for every 1 found with exercises like this). My reasoning is because every time there is a very high-priced bounty on an exploit, it seems to get discovered and pay out. So if governments and blackhats have people hunting full time for these exploits, you better bet they are finding them too.