"Why are so many so enamored by this unpleasant experience of swallowing unusual liquids and examining their fecal output?"
Perhaps people have had digestive problems. Which were improved by doing liver flushes. Did you ever think of that?
Did you ever think that maybe the condition of ones fecal matter might gain some insight into what may be causing the digestion distress?
Did you ever stop to think that just because something looks similar this does not mean they are the same. Soap stones look somewhat like real gallstones, but they are not the same thing. And have you ever stopped to think that relying on bogus internet information can lead to people misdiagnosing themselves and possibly putting themselves in a dangerous situation such as lodging a real gallstone in the bile ducts from ingesting a large amount of oil? Again, this is why people need to hear both sides of the story so they can research the subject from different sources and make a rational decision based on the evidence instead of following unproven quackery blindly.