Some people, including myself, enjoy to actually experience the game. That certainly includes the challenge (and sometimes frustration) of having to unlock parts of the game.
15000 faces recognised per second does not mean that's the figure upon which false positives are calculated.
Assume 10% are flagged as positive. (A staggering amount nonetheless.) Given 0.6% false positive rate, it would account for roughly 9 false positives per second.
Having said that, false positives are certainly a serious problem, causing hassle to innocent people.
Regarding Encarta, it appears access to it will be discontinued after October. Wouldn't it make sense for Microsoft, from a PR standpoint, to release its content under a public license, enabling Wikipedia to incorporate content it deems appropriate?
Seems like a stingy decision the way it is ("if I can't have it, neither can anybody else"), but that's not too surprising coming from Microsoft.