Value is subjective and it depends on the reader, it’s like any market price, it depends on the market which is nothing more than the manifestation of people’s opinion about the value of something.
For someone a post about cups for example, might be totally worthless, but for another it might be interesting and therefore, have intrinsic value.
So sometimes, 200 words can be more valuable than 2000. Who decides which is more valuable, the readers.