But Supporting Memberships are already a poll tax. As Deb points out, the physical things that you get for your money account for less than half of the cost of the Supporting Membership, and that fraction is going to continue to go down as Worldcons move to electronically-distributed PRs. The only other point in buying a Supporting Membership (as opposed to acquiring one through voting in Site Selection) is so that you can vote in the Hugos. Voting Memberships would not create a poll tax, they would reduce the level of the existing poll tax (and along the way make a lot more money for the Worldcons).