I didn't vote however I will say the way B&B does it I don't like.To make it short, if someone wants to contribute I think you should just ask for an appeal 1x a year and guys contribute whatever they want if they can afford it. I don't like this special badge identifying who gave what and special areas and perks for contributers because that just makes second class citizens out of the others.
If guys feel they get something out of the site then that should be enough reason and if that doesn't work we can think of other approaches. I also think if any site starts accepting funds from members that essentially changes things and the site has a responsibility to let the contributers know how those funds are being spent.
Just my 2 cents.