It wouldn't.

As far as your problem goes.

Seems like something is up with your optical drive, maybe Leopard just doesn't like it or the chipset controlling it.

Now is it just getting stuck when you try verifying the disk or does it error out if you skip the disk check and try to install anyways?

Also, do you have another machine available that you could try these disks on?

If they verify on another machine, then maybe a USB DVD drive would work...

Yet another option, although it's a little more involved, you could always put the iso on a partition or usb drive ( if it allows booting from usb, of course ) and boot it from there instead of the optical drive.