Ya, I think I'm gonna land on calling this a scam... Can't wait for bitmain to sell some more.
Of course it's a scam. The reason that no one can actually come up with proof, is that no one apparantly was stupid enough to proceed with an actual payment. It of course doesn't mean that no one has done it, but it at least shows that people have become more careful when it comes to jumping into sites offering "deals" too good to be true. Also, the domain name they use to run a "professional business" is pretty wacky, which more often than not rings alarm bells as well. If we have to look at the date the domain is registered, it shows that it was registered like 11 days ago. Another shady thing is that they use whois privacy - what legitimate business covers its details?
http://whois.domaintools.com/bigcoindeals.com