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Sometimes you purchase compromised MAK keys.

This violates Microsoft use policy and they attempt to lock down those keys. Typically they are purchased in areas were the volume keys are cheaper and then resold in the US market. The grey market purchases those keys in large quantities and resells them. When you buy a bundle of licenses you can use up to the amount purchased per your agreement, but you can have way more activation's because you are allowed to activate and deactivate all you want as long as you don't pass the purchased amount in use at one time. MAK keys are provided to volume license holders if they don't run a KMS (Key Managment Server). OEM keys retail around $150 and full keys are $200. OEM service providers such as Dell have tools in place that transfer the OEM key to a new motherboard when they replace it. If you swap the motherboard the key is invalidated. OEM keys are locked to the system hardware ID's not your microsoft account typically the motherboard serial. The cheap keys are typically MAK (Multiple Activation Keys) They are not OEM keys.