Some people say that ComicVine is biased because they tend to ban individual comics from being available. They sometimes offer more comics about a particular character as compared to others. Perhaps they base it on the things that people love to read. There are just some comics that are loved more by fans. There are also some comics that have excellent content, but people barely notice them.
They may sometimes base their decision on what they think will be checked out more by people. The problem with ComicVine is they have poor moderation. There are also too many fans that may have unrealistic expectations about what they can do.