A niche blog is popular among affiliate marketers. They use it to make money by promoting affiliate products.
In most cases, the marketers (especially newbies) find it overwhelming to manage and promote the blog simultaneously. After some days, they lose interest and leave the blog without reaping any benefit from it.
Some reasons for the failure are the lack of determination, a plan, and consistency. The problem mostly happens with newbies. However, experienced marketers gain experience after facing several failures.