If all those involved donated 10% of their wealth (they wouldn't miss it) they would raise a lot more a lot quicker.
But then they wouldn't get any publicity would they or am I just being cynical?
Many of them already do a hell of a lot for charity and don't go after publicity. The same as many of the Premiership footballers. One I know spends a lot of time with terminally ill kids but it has never been mentioned in the press.