You are right and the campaign on which the user was still active. So, there was no chance to earn less than 100$ per week. I can't imagine a healthy-minded person can act like Edwardard did.
You think it was some kind of exit scam, where Edwardard just got tired of being here and decided to wind up his bitcointalk "career" by stealing from you on his way out? Assuming you don't hear from him, that's what it looks like to me and it's unfortunate--I recall when he was managing at least one campaign at any given time, and I remember thinking it was odd that he'd started participating in campaigns rather than managing them.
Either way, sorry for your loss. $1000 is a lot to lose to a scammer no matter how much money you've got (and I don't have a clue as to your level of wealth, I'm just saying).