I second this thought as well, it seems like the majority of Auctions are always domains for sale. Maybe a combined Goods/Auctions sub for domains or maybe just an Auction sub- "Domain Auctions". Just a thought.
Combined Goods/Auctions sub would not be good unless admins make some kinda tick button for "auction style"
But a dedicated "Domain Auctions" would work. It is extremely important that post in a auction section cannot be edited.
I would think that a domain sale should be in the digital goods section or the regular auctions if it is an auction. I'm not saying we should add sections for every popular item. I just think that physical bitcoins on a bitcoin forum probably deserve their own section. I also think the signature campaigns/affiliate offers/faucets are a nuisance to those actually looking to provide or obtain services and the people using those services would probably appreciate having them all together as much as those who don't care to see them would like them out of the way. There are hundreds of signature and affiliate campaigns in the services section. You only need to look through a few pages and count for yourself.