Love these films, but are they really "cult" films? Here's the definition of what a cult film is.
"The term cult film is used to describe a film that has had little to no success commercially and critically upon its initial release but has later spawned a small, but devoted and usually obsessive fanbase... This has led to a misconception in Cult classic films that the definition is a film that 'you either love or hate'. Usually, cult films have limited but very special, noted appeal. Cult films are often known to be eccentric, and do not follow traditional standarRAB of mainstream cinema and usually explore topics not considered in any way mainstream - yet there are examples that are relatively normal. They are often considered controversial because they step outside standard narrative and technical conventions known."
I think the word classic is more fitting for most of them, although Angel Heart is both (box office flop, gained following on video). Can't help myself sadly as I am an English teacher!