I am in the trademark field, and applying for a well-known Chinese trademark requires 800,000 to 1 million yuan. And there are also many restrictions, such as being among the top in the same industry, and the company's annual advertising expenses must reach a certain number. As for if you are a well-known trademark and want to sell it, you can only look at how famous your brand is, what kind of products the trademark produces, and whether it is popular. This is impossible to say.