Couple quick points about this. Everything goes to charity... but not everything goes to a specific charity. 501Seats, like any charity, has operating expenses (bandwidth and credit card processing fees aren't cheap!) so some of it goes to defray those expenses (we just like to be honest and note that yes, 501Seats uses some of the money, but since 501Seats is a charity, that money is still helping a charity achieve its mission).
Still, the majority of the proceeds from a bid go the charity of the donor's choice. We agree that not everyone supports every charity, and we try to be very open about the charities being supported. However, some donations come with certain "strings" attached, and this is the case with these tickets. But they were too good an opportunity to pass up, so we accepted the donation even with the caveat of not being able to divulge the donor or the charity.
Still, we understand if this is a concern and accept that it might limit the appeal. If you're interested, here is a link to a list of some of the other charities we support:
www.501seats.com/about/who