I agree @arkadia, some of the parents probably don't have a full understanding of what they have signed up for, or how it will affect their children. I will admit I don't know anything about payment- do the working class people who appear on shows like this usually get paid?
I agree @unlimiteddilutingjuice the biggest problem was the children's own self esteem- very much not seeing university as for "the likes of them". I thought the same was true with the boys. Also they seemed very aware of financial stress and family worries for their ages.
I think it's all about critical mass- if a critical mass of your peers expect to do a-levels and go to university, then you probably will too. If they are aiming high for competitive degrees at top universities, you probably will too, if you are able. Equally, if lots of people expect to go to college to study vocational qualifications, or do apprenticeships, or drop out of education all together, you are more likely to do that. If a critical mass of your peers expect to live on benefits, then you're less likely to aim high.
If I was going to be really negative, I would say maybe 1 of the 6 children will get GCSE results that reflect their actual ability, and go on to a good university and "get out". At least one of the children will have a child young and this will affect their life chances. One of the children will disengage with education totally before GCSEs. One of them will end up with a drug problem or a criminal record. The other two will achieve something and go to the local college and maybe a mediocre university or get an apprenticeship, and achieve something, but nothing like their full potential.
I really hope I'm proven wrong!