I always found the thought fascinating: Whenever an artist gets the "ewwww,gross!" response for his subject matter,the "blame" lies equally to both the artist and the viewer.Whenever a mind reads "guts,blood,gore,slime,slit wrists,fingernails extracted",you-name-it, all the artist did was take some pens, markers, watercolors and pencils and scribble some lines on paper.It doesn't even matter if it looks realistic: a shaky, black $ white sketch pretty much yields the same effect.The mind of the reader goes to "suspension of disbelief" mode, and a whole series of experiences past,present,real,imagined or traumatic are called in to do the dirty work of transforming the few lines in a nice, complete "ewwww, gross!" experience.
Thanx, guys! Remind me to pay you a modest sum for your efforts ;-)