The 'seller' said the private key was being sold, never sent it.
When you pay 0.60 btc's ,what should you be receiving or demanding first ?I think any sensible person would use an escrow to verify the details and not send the money without a having access to the staked address.
Why? We don't know.
Because he wanted to scam,as easy as that.
How do we know that ltcfaucet didn't just not give to come back a week later and claim it as his own?
Staked address is stupid in that sense.
He probably is.If Op can prove it then obviously he will continue with the ownership rights of that account.