When you have a family to help you, there's no comparison really. Nothing beats family in these situations. Your daughter had you to help her, so I don't think she would have needed this sort of care. When you're recovering from a hospital stay it's difficult to improve on your Mum helping you out!
But if you were unable to help, if she lived alone, then perhaps that would be the sort of person the scheme could help.
If the choice was asking the host to help or doing it yourself (or not) every night, perhaps some people, not everyone, but some, would prefer it. It could be as simple as the reassurance of someone else being there.
As posters have already said, there are people who would make great temporary carers in this sort of situation.
I disagree about the money - £250 a day works out to around £55k a year - enough to attract people who are just in it for the money. I don't know if £50 is the right amount, but I'm pretty sure it's closer than £250.