Depending on the Planar setup of your world, you could say that undead are more likely to arise naturally when the Negative Energy Plane is "closer" to the Prime Material Plane.
Yeah, I would never let someone who has just eaten Doritos touch any gaming book. I like Doritos, but I have to practically scour my hands clean with very hot water to get the scent off of my fingers.
It is in the RPG Market as a free item...
It WAS in the RPG Market as a free item, I guess people got annoyed with getting them and now the cost is 1gp.
I got mine before they cost anything.
No, it is not an insult.
I understand where you are coming from. I myself am largely a core rules + setting (Such as Dragonlance or Ravenloft) rules person. So, I do not really bother with all of the extra rules supplements that come out.
It does seem like a lot of new content is being released, or at least previewed...