why people don't have passwords
In my case, x-pc people, simple don't understand the importance of the passwords in mac world.
I have bought several used pc's for my kids, and if there are passwords they are not important to upgrade and for cleaning out things. Many used pc's don't come with re-boot and software disks but it's no big deal.
For mac's I have learned the disks and passwords are very important, but I've learned the hard way. Given the lack of this specific info in the pc world, and the conversion rate of pc'ers to macs, I would bet these types of posts will increase.