Where are you getting these stats from?
I am the only child in my house and we get £554 child tax credit a year and not much else. We live in a council house so we have reduced rent and council tax, but because we receive benefits £40 of my dad's £50 a week wages are taken in tax.
Yeah, they take 80%. Don't say it's an easy life, because it really isn't. You don't get as much money as you are claiming. Hell, we can't even afford to pay our bills next quarter.
EDIT: I just looked up Housing Benefit and we get none of the thousands you are claiming, as it is paid straight against our rent. It goes to the council, not to us.