Big thief. I traded 70$ and he transfered the BTCs after a long time. However, when I tried to trade 200$ through Neteller, he never transfered anything; it's been almost 3 weeks. In my country, Dollar is really expensive... I'm very sad I lost this money 
Well did you open a scam accusation thread? Did you use escrow? Did you do any thinking at all before sending this asshole your money? I wont go as far as to say it serves you right, but you need to be smarter. Don't trust anyone on this forum. The dude above me said it best: accounts are bought and sold all the time and it's a shitty practice. You don't know who you're dealing with. Hell even if you do know, they could still scam.