Conventionally accepted spelling, grammar and typography are not absolutely necessary when writing. However, if deviations from convention distract the reader from the actual point of the text, that's a disservice both to the reader and the writer.
@liw That is well said.
@liw Anekdatum: I remember barely anything of Neil Gaiman's novel Coraline, because every time the protagonist's name was mentioned it pushed me out of the story because it looks like a typo of "Caroline".