I'm with you, but I am not sure influencing the buyer/seller fee terms is a possible goal at this point. That is how the auction houses are competitive with one another (along with website ease of use, marketing, and advertising.)
As devil's advocate, and without a way to confirm, both HA and Romitaman stated his shills paid their buyer's fees. No mention of a negative seller's fee and I don't think anyone's confirmed that HA offers this (unless I missed a post.)
However, as the comic art market is now maturing (both in dollars and cultural significance) and the Old West mentality is pushed out, these are important points moving forward.
If someone can post some tips on how to cross-reference current lots with Romitaman's past inventory (via wayback), I am sure we can all pitch in to help.