Regarding singing crap at the behest of people: I would think everyone who posted here sand Happy Birthday at one time or other. It is friggin' awful. But, we all likely sing it a few times a year.

Singing the Horst Wessel song would be whoring oneself. Singing "The Vovage", the lyrics of which leave a bit to be desired, is not whoring oneself. It is making a living, IMO.