All languages in the world are priceless. Because it carries the culture of various ethnic groups.
But when you expect to make a lot of money just by writing a few words, Chinese characters are the only option.
陈佩秋 Chen Peiqiu （1922-2020）草书八屏
final price：￥8,625,000 =$1,216,264
《送瘟神》 created by 成忠臣(1964-) Cheng Zhongchen in 2019
final price：￥1,830,000=$ 252,981
As long as you can write Chinese characters well enough, copy a few poems and write twenty or thirty words, you can easily earn a million a year.