UPDATE
Ok, I've talked to AccountTrader and he has started making good on his deal with me. Apparently he had an accident which has added to the delays but regardless, I can confirm that he does have real accounts.
So he is not a scammer, but if you place an order you just need to be aware that it may be a number of weeks before it is completed.
Once my order is completed I'll be sure to let everyone know. At least this is a positive development and it's nice to know that not everyone is out to just take your money and run.