I would suspect that no one who paid the money and attended the functions would be willing to speak up about it. They would never be asked to attend another one, and any future business considerations would be made much more difficult for them. Even in China if the  Liberal organizer/rep has ties to the Chinese government.

The Federal Liberal party has courted the top echelon of the Chinese business community, speaking up publicly will gain the complainants nothing but problems.

Sadly, the Federal Liberals will dodge one here.