The front page of their site should have a very detailed break down of everything coming in and going out. Every cent should be accounted for.
Anyone and every one should have access to where their money is going.
I wonder how many people, that see the ads for the HSUS, think that they really help the animals shown. I bet 95% of the people have no idea where the money really goes.
If they can't supply a detailed breakdown of where your money is going, then they shouldn't be handling YOUR money.