CUZ THE ARE BROOKEN well the monsters have a high rate of otk then in order for the otk to work you need the syncros like brionic and mist wurm to send cards back to your opponents hand oh also theres the barriers thats like 80$ each and they make sure your opponent cant do anything because they are top tier and a very explosive deck. the deck is great. thats why.because they're goodbecause there rare and popular cardsMany of the key Infernity cards are rare, and therefor in low supply. Infernity Synchro OTK is currently one of the top meta decks, currently second only to X-Sabers in tournament wins. This puts them in high demand. When supply does not meet the demand, prices rise until they hit an equilibrium. This is why Infernities are so expensive.