Nine Layer Nige :
I understand, but why then does Microsoft allow activation in the first place if it can at a later time, de-activate it ?
I just trying to understand the MS brain ??
No one understands the MS brain. Not even MS.
Future deactivation? It's just that the activation servers have not yet correlated the license you bought with actual valid sources.
If it is significantly cheaper than the usual retail sources, ask 'How'.
How is he able to do that and not sell at a loss?
He got them from an authorized reseller? Where did that reseller get them from?
Several layers of 'resellers' later, you find that these are hijacked MSDN keys, or bought in bulk with stolen credit cards (money laundering).
1 guy selling his own license key for cheap is one thing.
1 guy selling 5,000 license keys for cheap is something else.
We'd all like that Windows OS to be cheaper. Sadly, it is not.