>>532190142
While not quite what you're asking for, in a now deleted tweet from 2023, 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.
For reference, Ikeda is the former director of Buddyfight and current director of his own game, Gate Ruler. He used to be the one who compiled the sales data that gets discussed, but he stopped doing it this year after getting into a twitter beef with Kaz's former editor