we 'used' to get youth allowance when my mum (i only live with my mum) was earning under 50k (she nows earns 55k and we dont get youth allowance).
but we (myself and 3 sisters) gave our youth allowance to our mother while we were still at school, but when me and my older sister began uni we got the money because of uni fees, books, petrol etc.
if your parents are not in a position to support you, you have got to bite the bullet and get a full time job, its as simple as that. i dont complain that i get no support from my mum, i just go out there and do what i have to do.
i also pay board to my mum and whilst working full time, i am still able to attend uni semi-full time.
on another note, some families (mine included) depended on these payments to just 'live' my mum still has a mortgage that will take atleast another 10 years to pay off and she is 52 and she has got barely any super (i suspect it to be roughly 30k). now dont tell me your life isnt fair.