While I think it's pretty poor show of the OP to delete, I can't agree with this.
I have half a dozen shotguns in my safe that if I looked every day on the EE it would be the rare year that a similar gun from the same maker came up for sale. If I was to decide to sell one (or see one I might want to buy) I think one of the values of a forum like this is to be able to discuss valuations. However, the endless requests for valuations on different 870's, M12's, modern auto's etc is sheer laziness as a good survey of the market can be conducted quite easily.
As far as using a thread here as an "ad" for an EE listing, big deal. The odd time it's actually happening, who cares? To me, that's just being a busybody. Let the mods deal with it or as they say over on my favorite un-moderated site...."if you don't like it, don't read it. No one is forcing you to."