Let's talk about not standard use of the reflexive pronouns (myself, yourself, ect.): 'Perhaps, lt'd be more useful if I were to transfigure Mr. Potter and yourself into a pocket-watch.' Attention! Such use attract criticism because, according to strict grammar, 'you' should be used as object: 'Perhaps, lt'd be more useful if I were to transfigure Mr. Potter and you into a pocket-watch.' Some people might use myself because they consider it in some way more elegant or refined. Staff who deal with the public in businesses such as restaurants, call centers, etc, quite often use yourself as a substitute for you: 'Is this soup for yourself?; Is the appliance for yourself, sir?' Using yourself in this way should be avoided in any kind of formal writing, and is considered wrong by some people even in speech. Arguably, however, it fulfills a useful function in the situations mentioned: it sounds more formal and less direct than you, and is thus perceived as more polite.