If the point is confusing those analyzing the blockchain, then why do we have to make attractive offers? I was definitely going to try until I read that.
I guess he didn't want to promise to sign transactions from everyone. What if too many people responded? He's going to chose the 'best' ones in some way. Each of his 1 BTC outputs can only be spent once after all. It appears the demand has been less than overwhelming, so I expect he's just signed all the transactions he has received.