That's always the case for a novel exploit. There isn't a lot of value in popping somebody's PHP blog, so people who've invested time and money into a zero-day exploit have little incentive to use it for that purpose.
The white hats want to extend the time before an exploit is in the hands of the masses who might do so just for the fun of it, and the black hats want to use it on high-value targets.
The white hats want to extend the time before an exploit is in the hands of the masses who might do so just for the fun of it, and the black hats want to use it on high-value targets.