Questions on the point of "You're Next" and the overall plan
Two questions come to my mind regarding the overall plot, but I haven't seen them discussed so I'll ask here.
My understanding of the plot:
In order to inherit the money, the two brothers hire some (3-5?) professional killers to create a seemingly random home invasion by psycho serial killers where all of them family except them and their girlfriends survive.
Correct? If so:
1) What's the point of writing "You're next" in the first house and then the family's house? Would there have been any difference to the plot or the police investigation if it wasn't done? It seems not to make a difference one way or the other.
2a) Do serial killers go house to house? I would think killing two family's next door to each other would make it seem less random and more pre-planned.
2b) Is there such thing as packs of serial killers? I thought they are lone wolves. Wouldn't it being a group, rather than a single person, make it seem more pre-planned?
Hope someone has some answers, otherwise, I'm thinking there's no way the police would not see this as planned.