I for one actually feel much more secure knowing that iOS is so secure that $1 million is considered the public value of an exploit. Vupen bought flash zero days for $30,000 in the past so knowing that iOS exploits are now valued enough to attract this kind of bounty makes me much more confident script kiddies and scammers will not be able afford to attack me. And lets face it, we were never secure from the NSA in th…
This is purely market value. If iOS simply had less users, the price would be lower. So I think your conclusion of it being more secure because of this is incorrect. About less people being able to afford it - this again depends on what ZERODIUM intends to do with it. They may sell it for cheap and count on a large number of sales because, again, iOS is so popular.
"Mobile: VUPEN offered several different remote code execution and local privilege escalation exploits for Android; however, not all of them were 0day and Hacking Team deemed that the prices were too high to purchase. Though there was interest in purchasing exploits for iOS, VUPEN said they were limited to certain customers, presumably high-paying government agencies." [1]
"iOS exploit pricing: Adriel stated he was supply-constrained for iOS RCE exploits because exploit developers frequently had their own connections to sell them, and that he believed that such exploits were overpriced. An exclusive exploit sale could cost over a million dollars, [...]." [1]