>>532192023
>Ikeda Yoshimasa or ikettitencho on twitter mentioned that a card game is considered successful in Japan if it makes an annual profit of 1 billion yen, or roughly 6.7 million USD.
From what I can find just the OCG alone made 47 billion yen or about 302 million USD with 44 Billion Yen being the OCG and 3 Billion being Rush.