I'm going to take a guess:
From what I read, Apple is no longer creating "default graphics" driver support in Snow Leopard. That is the ugly, stretched out display you get until you fix the graphics drivers. So.... if a system does not have perfect graphic support, it will NOT boot. Because of this, we are all out of luck. The boot-132 disk will not make the The Snow-Leopard Retail installer disk boot, and your new system will not boot without supported graphics.
That is why you have to install Snow onto a separate hard drive, and patch the graphics (while your computer is booted from another disk). That seems to be the only way to install Snow, for the time being.
Just my guess. Could be wrong thinking. I also could be wrong thinking that Apple is doing this in spite, to make it more difficult to install their operating system on a generic PC.