Corrected entry: In the opening episode to season 6, the Scoobies are using the BuffyBot to try to make everyone think that the Slayer is still alive. If that's so important, then why do they have her grave marked with a headstone with her name on it? 'The Wish' proves that bad guys do know her name. Vampire Xander: "Buffy. Isn't that what they call the Slayer?" This shows that the smarter demons and vampires do have some idea who she is. Add the fact that it wasn't just demons but Dawn's school and Mr. Summers they were trying to trick into thinking Buffy was alive and a marked tombstone is a very bad idea.
Corrected entry: When Buffybot shorts out in the alley in 'Bargaining, part 1' she automatically returns to the Summers home to find Willow, suggesting she goes wherever Willow is likely to be. Later in the episode when she's wounded by Razor she runs straight to the grave where the others are. Shouldn't her first objective have been to return to the Summers house, and if not, how did she know where they would be?
Correction: Buffy's grave was placed away from where people would easily see it. When the Scoobs raised Buffy from the dead, she was buried in the middle of the woods, so people would be unlikely to find it.