Many of Mr Rooney's Manchester United team-mates earn tens of thousands of pounds a week.
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The Claire House hospice in The Wirrall, where Mrs Rooney's ten-year-old adopted sister Rosie receives respite care, received gifts of £500 from four of the £5 million wedding's guests, according to its chairman Dennis Mahony.
He made a renewed appeal for donations to help the hospice, which houses ten beds for severely ill children, to stay afloat amid the economic crisis. He said its nurses had offered to take a pay cut.
"We've been looking at ways to reduce our costs and one of biggest single costs us providing the care," Mr Mahony told The Daily Mail.
"We don't want to affect that in any way, we've got too many children and parents depending on us. Our staff have very generously offered to reduced their time where it can be reduced and we are considering that as one of the possibilities."
Rosie suffers from Rett syndrome, a neuro-developmental disorder which prevents her from walking and talking. She needs to be fed through a tube.
The Rooneys have previously been praised for their support for the hospice. Mrs Rooney has promoted it and appealed for donations. The couple were said to be "extremely disappointed" by the £2000 total.