The over inflation of an establishment's true worth by unqualified, self-affirming know-nothings ("yelpers") & the immediate feelings of anger, disgust, remorse, and self loathing that inevitably occur after one heeds such advice.
Damnit, Joe! Those lousy yelpers tricked me into thinking a run-down hole-in-the-wall *insert establishment* was the second coming of *insert god/messiah figure*!
Ha! Another victim of the yelp effect, sucka.