I KNEW IT!!!! When DS6 and I came off Expedition Everest, it's no surprise that the plush Yeti Monster balls were staring at us from 3 different directions and climbing out of the barrels onto the floor. At $19.95, I wasn't going to get out of there without buying one. When I said No... DS said he wanted to ride EE again. Since there was no line for EE... he got a 2nd chance to convince me (maybe he knew that since rides always exit into a souvenir shop). Feeling somewhat guilty about saying No (and paranoid of those things staring at us...) I felt compelled to reward DS for his bravery riding EE the 1st time (and 2nd time). I have a feeling if I said No again... he would have asked to ride EE a 3rd time.
Sociologists and social psychologists could have a field day at WDW. For all I don't know... WDW employs them to study crowd behavior to increase souvenir buying, improve safety, and other things. I know they employ statisticians to crunch numbers for planning staffing and analyzing pedestrian traffic flow for bus routing.
I should spend more time just kicking back on a bench with a Dole Whip and being a people watcher.
First timers (like I was in 2008) are quickly institutionalized into WDW norms. I notice it because people can't help forming a line even when there is no line. Tusker House (with POD stations instead of a line buffet) is a perfect example. I've seen long lines form at one end while all the pods ahead have no one at them.