It does not hurt at all. However, I would advise on anyone trying to corner a market. If its an item that sells alot gems etc. then you will be undercut before you try to resell the first one. I was sitting with 160 scarlet rubies when I tried to "corner" that market pre epic gems. It was so frustrating that I vendored most of them. This was before I found my secret to riches that I let go in my first post.
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