: These are intended for large manufacturers like Dell or HP to pre-install on new hardware.
The primary reason eBay is flooded with Windows keys—often priced between $2 and $20—is the existence of and Volume Licensing agreements. buying windows on ebay
: Because many of these are volume keys, Microsoft may eventually detect that a single "business" key is being used by hundreds of individual eBay buyers and blacklist it, resulting in your Windows suddenly becoming "unactivated." : These are intended for large manufacturers like