Analogies are not literal references. They are, in fact, typically applied with an extreme contrast in order to represent and point out the similar though less extreme virtues of the point in fact.
Ergo,it does not matter how much guitarists are paid or how in-demand they are. Guitar playing is an aspect of skill, one which is not easily mastered and one which relies heavily not only on metal aptitude but on physical acumen. Guitar Hero, on the other hand, while requiring both attributes does not necessitate nearly the level of competence required to play a real guitar.
Interpreting analogies in a literal, face-value sense renders them utterly useless and invariably falls to the asinine enterprise of attempting to validate a metaphorical statement into realistic contenxt when it was intended only to act as a contrast of application by comparison.