You've touched on the real skill that makes for a good scam detector: knowing code, knowing how to code, and having some experience coding. An experienced coder, I'm sure, can spot someone who "promise{s} heaven on earth in a short time."
Maybe it's because I got sucked in, but I was wondering if the original poster was a kid who thought he could 'bootstrap' his big idea by hiring a real dev to code it for him in his timeframe - and who then vamoosed because he got turned down.
On the other hand, his behaviour pattern fits a scammer who covered his backside in preparation for pulling off for another scam...