I've been approached by two separate friends who are slowly getting in to photography. Both have newer DSLRs and 2 lenses each. Their second lenses are large aperture primes with their kit lens. They always ask me for advice and most recently I told both of them to buy external flashes. Neither of them felt like a flash was necessary. Coincidentally, both wanted long zooms but neither could tell me what scenario they would use a telephoto lens. I also advised of a flash because both are always using their camera at indoor parties/gathering.
I personally only use the pop up flash when I have no choice. I also don't like draining my battery with the pop flash. My friends believe it's enough.
Do you find it difficult to sell people on the value of a flash? Anyone see this belief among their friends new to photography?