To me, everything became rather evident after this would-be scammer had one-in-one copied Stunna's signature style. Now I am more interested in what those guys are going to do (lol) who immediately changed their flags sigs after receiving payment from Stunna...
I wouldn't exactly say that set alarm bells ringing. If I was going to set-up signature adds, I'd probably steal Stunna's and just tweak them a little

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Had the OP been actually going to pay out that much money (huge $600 for the upper tier at the time), I think he would have bothered to make his ad signature look like nothing else out there instead of just copying it, lol. You don't take into account the total sums involved in these campaigns. Last time Stunna, by his own words, ended up paying out more than $10,000 in payments...