Get all the skins of Mortal Kombat would cost 4600 Usd or 3390 hours of play.
The players of Mortal Kombat 11 are already claiming: the microtransactions of the video game are terrible.
However there are packs like the 5600 crystals for US $ 40, which will significantly reduce the cost since before we would get 4000 crystals with this amount. You would need exactly 115 of these packs, so we would spend US $ 4600 instead of US $ 6440.
Although it is true that all skins can be achieved in-game, the user of Reddit who has made these calculations has come to the conclusion that this would require about 3390 hours of play.