I think the OP is thankful that his (and most people's) IT staff doesn't care so much.
		
		
	 
I've never worked with a network admin that was not concerned with the traffic.  They definitely care.  It's just up to how many tools you have at your disposal to control/throttle it.  Otherwise everyone bitches about how slow the network is.
Where I'm at now, we only have a T1, and we allocate 10% to youtube (I'm at a school, so the teachers use it), and it is always pinned.  We recently bumped it to 30% just to see how much is really being utilized, and it pinned within 5 minutes.
Oh and we do nail the kids bypassing the proxy too, it's real easy to tell, and it's sad when we confront them, and they act like they have no idea.  We even had a kid who set up his own proxy with a domain from godaddy, and used his mom's credit card number for the account.  We had the ISP, godaddy and the school district involved with that one.  Goodbye college scholarship crafty senior 
