The "money agent" acts as a cut-out and delay tactic.
Usually it's combined with a parcel re-shipping scam.
It works like this:
"Sell" high-priced items on eBay, use the local bank account of the mule to collect the money. The victims will trust this process because a local bank account is involved. The mule now transfers that money through irrevocable money orders into a non-extraditory country.
The victims will go after the mule, but the police will take some time, so you get 2-4 months out of a mile until he is arrested.
At the same time, you order high-priced items using stolen credit cards and have them delivered to the mule. The mule repackages them and sends them to the scammers. The shops will go after the mule.