Re: It's an elevation attack.
Then please don't ever get a job as a Sys Admin.
Defense in depth is key to security, UAC prevents people running bad software that compromise the machine because the easiest, simplest way to hack a computer nowadays is to get a user to run your evil code. If that user is running your evil code as an admin UAC goes a little way to protecting your machine outside of your user profile.
A low-level user who demands to run as a local admin (because, users) runs something, it pops their UAC and infects the machine.
User then calls front line support guy, who has networking privileges but nothing scary, he cant see anything so calls the 'big sysadmin' down to fix the problem. He logs on to the machine, you just lost your network.