The best way to find out is to buy one only if you yourself are ready to use it.
Install windows 8 and activate.
I don't think 25 is too bad for a legit copy of windows 8.
If I was trying to scam I wouldn't say I had four, more like 400. 

What if you scam him as well? If he scams you or someone else then come back here and tell everyone about it and he wont be selling any more accounts again. And it's not a complete loss if the name gets revealed. I don't see how it would anyway.

Why we need this account?we can creat one ourself.

He says he'll use an escrow, but what would be a less outrageous price? They are expensive but you could make the money back quite quickly on sig deals.

any problem with the site?
Payment confirmed but 2 hours later still "processing" on the game (Kerbal Space Program).