anyone who is dumb enough to give btc/money to this obvious scam deserves to lose it all. We are not in the bfl/avalon era anymore. No sympathy when you come here whining in Sept for non-delivery.
It's not the question of whether it is a scam, but a question of value. Viper 5Mhs probably cost no more than £50 each to make and they are selling it for £1600 ish.