Metal Gear Solid V: The Phantom Pain has microtransactions. We know this. Konami told us they’d be in there. They’re optional, but they are there. Based on the pricing, however, it may just be better if you’re patient and wait for elements of the Forward Operating Base to unlock naturally, because it may be too costly otherwise.
The Forward Operating Base is an online, competitive mode. It involves constructing and maintaining your own base for assaults against other players. You can let things grow over time, or spend real cash on Mother Base coins to make upgrades instantly appear. The exact pricing is $1.65 for 100 MB Coins, $7.95 for 550, $15.95 for 1150, $48.95 for 3500, and $79.95 for 6000.
So if you go online and see someone with tons of improvements today, you’ll know they spent a lot of money to immediately be the best in the Forward Operating Base mode.
Source: Metal Gear Network