LOLLEME,
I think you misunderstand what bering tried to tell you.
As a middleman, the buyer and the seller send me the money and the account info respectively.
Then, the buyer check the account and if everything is ok, the the money are released.
In such transactions, neither the buyer nor the seller want to send first the money or the account. That's why, they usually use a middleman.
Because of many middleman-scammers who are trying to grab everything, I offer my services as a middleman in order to avoid such issues.