That may be so, but you pay for it so what does it matter?
I'm with Be*there and frequently do 500GB+/month and frequently max out 10Mbps for days on end. I did 1.05TB in a month a few months ago. Not a peep from Be*

Did 800GB frequently when I was on Virgin 10Mbps too.
I still can't understand why the ASA haven't stopped Virgin selling an unlimited product when it's obviously not unlimited. I think the word "unlimited" needs re-defining in advertising. It's like this: "Unlimited texts!* ............. *Maximum FUP 3000 texts a month" ... That's NOT unlimited then is it! Etc...

</rant>