I am not Mr. Jobs. There are plenty of things that violate EULA's, plenty of people still decide to break them. Very similar to people not paying sales tax on Amazon.
If there was a system check, you wouldn't be able to install Snow Leopard on a brand new hard drive. They just use the same disc for the upgrades (not drop ins), single user license, and family pack license.
I am not Mr. Jobs. There are plenty of things that violate EULA's, plenty of people still decide to break them. Very similar to people not paying sales tax on Amazon.