Cow Goes Moo
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http://www.gamespot.com/articles/metal-gear-solid-5s-online-pvp-mode-locked-behind-/1100-6429981/
In The Phantom Pain, players use various resources acquired within the game to facilitate the construction of an off-shore base, but in order to participate in the online multiplayer mode, where players attack each other's bases, they must first use real-world money to purchase MB Coins. MB Coins are then used to purchase open water in the game to make space for a PVP-dedicated base. This was discovered during GameSpot's review process for The Phantom Pain, but without online functionality, we couldn't determine the cost of MB Coins, or fully evaluate F.O.B. mode.