I think auction houses don't add services because they don't have to.... We allow them to get away with it by continuing to bid.
As for allowing winners time to pay... the auction folks want that 'one more bid' to add to their commission. And the bidder-whales make that one more bid, then mention reneging on all of their bids if pressured to promptly pay. I've actually had a reputable house admit as much to me once when I was awaiting payment for a sale. I think as a seller you can ask that the house promises to pay you within a certain number of days, or you can ask for an advance on the sale price. The houses don't want to do those things, but I've had them do the latter.
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