They also engage in calligraphy, and some teach people; Some go to tutor; Some engage in mounting; Some open schools; Some published books; Some sell words. . . . . .
I guess you mean celebrities who donate money by writing? Even calligraphers, the prices of different people's works are different.
People who are also engaged in the calligraphy industry may earn millions of dollars a year, and those with low incomes may be similar to working. This is too different.
Therefore, you can't say how much calligraphy earns a year.