I think one real key would be user verification, to make bidding as transparent as possible.
@Siusaidh - With the right KYC process in place you could verify the identity of each bidder however if one single entity controls the auction then you have to place your trust that each bidder really has been vetted and in cases like Rob, you have to trust that those bidding against you are real bidders and not fake users specifically created to increase the bids on a domain in order to gain maximum profit.
This would be hard to tackle which is why i suggested multiple Acorn members should have "Moderator" access where they can see the real bidders along with all the auction data because i suspect a single entity is not going to be able to pull the wool over all the "Randomly selected" moderators eyes in order to be biased on their own auctions unless in industry really is that corrupt.
Ultimately we need to know for certain that each and every bid is made from a real user and not a user who is financially benefiting from making bids on the domain by way of pushing the price up or by way of a 50/50 split share on the hammer price