These keys are for my personal use and which I don't use them so I don't have any rules. Once the key is sold its yours, You can do what you please with it. I do not touch it or use it. What you do with the key is up to you. Obviously posting the key for the public or using it to torrent sites as keys or some sort can get your key blacklist.
I just recommend buy only for personal not resale (although you can)
My question is, if I buy one of these keys do I have a valid license to use the product. Like if Microsoft comes in and audits my business or makes some complaint against me personally, am I licensed or not?