First of all, Zheng Banqiao is not a great calligrapher. The best thing about him is in his paintings. He is famous for painting bamboo, so his reputation is so far-reaching. But as long as the reputation goes out, you won't worry about others not knowing.
Although Zheng Banqiao's calligraphy is only of medium level, if compared with the calligraphers of the same period, I find that Zheng Banqiao's calligraphy is very special and different from others'. He doesn't care about brushwork, but he emphasizes the skill of using ink, which is the biggest difference between him and those famous calligraphers.
If you get used to it, you can get used to it. If you don't like it, let it go. We can see his calligraphy works. The handwriting is not particularly smooth, and it is astringent in some places. But his works, especially his works, are a big reason for being sought after.
But we should know that being famous for calligraphy and writing well are two different concepts. Besides, Zheng Banqiao is so famous not because his calligraphy is good, but because his paintings are great. Moreover, his reputation is far-reaching. He is one of the Eight Eccentrics in Yangzhou, and his fame is naturally greater than others.
Therefore, in the current auction market, Zheng Banqiao is definitely famous. Although he is good at painting, his calligraphy is very popular.
Moreover, his personality characteristics, actions and life experiences seem to make everyone more curious about him. His calligraphy refers not only to the price of calligraphy works, but also to the value of Zheng Banqiao as a celebrity.