What about selling at auction vs consignment selling?
Auction houses can offer sellers a feeling of cache and exclusivity and knowing this the auction house heavily market their abilities to achieve high prices for their consignors. Our own findings from many clients over the years can paint a different one where words such as "over promise" and "under delivered" are frequently used.
They can be expensive places to sell work commissions vary depending on the establishment but the nature of the beast is that they can be unpredictable with pieces selling for both vastly over and under market rates.