I can't imagine any person can send such a amount at a time
I can't too, and i pointed this out to OP earlier in this thread and his reply is that he has successfull traded amounts in the tune of $70,000 and $80,000 previously, these amounts i believe are even too large to be done in one transactions and OP was lucky that this scam exchange processed those transactions. What's done is done though, and OP cannot drown in regret, but if he is going to get his money back, i am sure it will take a long time.