These questions frequently don't have definitive answers. They ought to be referred to bitcointalk, which has, literally, an entire section of the site dedicated to accusations of scamming.
"Is X a scam?" has two sorts of useful answers:
- Yes, they are a scam, they scammed me, here's my proof.
- I think X isn't a scam, because of circumstantial evidence Y and Z.
Second, these questions are much better answered by a forum.