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Are the ticket genuine and the shipping fake or is the whole thing a rip off ?

The entire thing is fake. The scam is somebody wants to sell <desirable item> but to make it "secure" for the buyer, they're going to use an escrow service. The theory being that they send the goods to the service, you send your money to the service and then it'll do a swap for you. The dodgy bit is that the escrow service is actually fake and run by themselves. The extra twist in this case is that they're advertising in the US but saying they're in the UK.