The other dimension to keep in mind is time. Governments can just cash out whatever {Vupen|Zerodium|rogue researcher} ask for, and get a 0-day for any major pla

The other dimension to keep in mind is time. Governments can just cash out whatever {Vupen|Zerodium|rogue researcher} ask for, and get a 0-day for any major platform waiting there to be sold. Any obscure, probably less-secure platform has surely gone through less research and time becomes key: probably there will be no time to develop an exploit within your operational window.