Because it frees up disposable income from the parents. If they didn't pay their way there would be less money to be paid into the IVA.
New Leaf, I'm really sorry, I thought I'd already said congratulations but looking back I haven't! Congratulations to you and Mel's team, and good luck for the future x
It is entirely fair for creditors to expect adult working children to pay their fair share towards board and lodge, and if this improves the parents disposable income all will benefit.