Some good ideas. Here is my suggestion: Three-part process: 1) 60-day marketing campaign to advertise the availability of the ENS names to be auctioned off, sufficient to provide notice to all prospective buyers, using social media, print media, and mass media. 2) Have an open-bidding auction period of not less than 30 days in which any bid in the last three days extends the bidding for three days, and that a reserve amount be set that must be exceeded for the bid to be honored. 3) If the reserve amount not be met in the open-bidding auction with a qualifying bid, then the bidding reverts to a Dutch auction.