Why does Jo stop writing magazine stories for which she earns good money?

Jo stops writing her well-paying "sensation" magazine stories because she learns that Mr. Bhaer disapproves of them. He notices her one day turning over one of her magazines in order to hide the lurid illustrations of figures such as a corpse and lunatic. Seeing her do so, Mr. Bhaer realizes she is ashamed of what she writes. Although most people would not believe they had a right to say anything, Mr. Bhaer feels he must speak to Jo about her writing for these publications.
He tells her he thinks it is unwholesome to write these kinds of stories. Jo protests, saying that the tales are silly, not harmful, and that plenty of respectable people make a living from writing them, as they are in high demand. Mr. Bhaer responds by saying:

There is a demand for whisky, but I think you and I do not care to sell it. If the respectable people knew what harm they did, they would not feel that the living was honest.

Later on, Jo thinks about what Mr. Bhaer has said and decides he is right. She burns her stories, thinking it is not a good idea to make money from writing sensationalized thrillers.