There are plenty of "real" looking ordinary people in microstock. 

Problem is they are nearly impossible to find, drowned as they are in a sea of Yuri's and Monkeybusiness's  perfect looking, cookie cutter images. 

If the micro sites don't find a way in their search engines to allow the real people type images to see the light of day, they will continue to lose buyers to Flikr and the like.   And adding the keyphrase "real people" isn't helpful because buyers don't know to search for it. 

he probably did find a few people that knew the correct answers, but those would have been edited out due to lack of entertainment value.   

I heard once that there is some kind of special case made for aerobatics and demonstration flights at air shows, where under most circumstances they are not eligible for stock unless some kind of release is granted by the performers or airshow authorities.  Presumably that is because the aircraft, parachutes, certain manoeuvres and smoke patterns are very distinctive and recognizable.  Probably that is more of an issue for unique acts like the USN Blue Angels, and less of a problem with an ordinary Pitt biplane doing a loop or something, as long as you delete the ID numbers and maybe alter the custom paint job.

I have got some photos out there of antique aircraft sitting on the ground at airshows, with no people visible and with any writing or distinctive custom markings shopped out.