answer is: No
These transactions are mostly fake and phishing expeditions with the intention of fraud and abuse, some relate to sting operations.
The real ones are either government related or operations cleaning up the background of past transactions, include considerable risk and almost no reward for a broker which is not part of the inner circle.The rewards in existing transactions are not that big, but as they say "nut by nut" fills the stomach.The diligence requirements and all the details pushed around the net are fake. The amounts in question on transaction lines with banks have all very high level clearing, are known by the players and when the call for such transaction is made it is performed on an "fok" basis (fill or kill, meaning done or the file is , no running around, no searching etc). Real transaction partners have bank facilities to handle this and they are known to the players. Brokers are only used for non-liquid markets or when there is no forex market at all, meaning if the market liquidity of a currency is so low that there is no T+0 or even T+3 or even a T+10 is possible because of the amount (lets say the market liquidity is 10M daily for all and you have 1B) or a currency is not even exchange quoted.
The discount in these cases is related to the credit and liquidity risk and can be substantial, especially when there are political and inflation related considerations in the transaction.
The other part of these transactions is financial warfare and some are easy straight forward money laundering affairs.
It is not a market you entertain without a safety network, without extreme financial resources and compliance knowledge of banking all around the world. In other words, its nothing for the usual broker. The chance to make it in that market without the prerequisites is lower than to be stricken by lightning without injuries.