In my opinion his intentions were good, but he pissed off by the attacks.
As I said, with the difficulty increases, it's not 100% sure that an Antminer will pay off. His plan was to get 100% of the money back plus a small share. As I calculated before, he could have made up to 20 btc with a 15 btc investment (since psu and networking stuff will be reused)
I still hope that he'll come back...
I'll wait one week before declaring him as a scammer
I'm giving him some time to cool off too as he mentioned in his last post... but thanks for all the info on him. Hopefully he regains his composure and makes things right, because I'm sure he wouldn't fare too well if we start poking around employers, friends etc...