It's not a hierarchical thing. I just don't see him like a detective. He is a reporter. They are two different things. I am not sold on Vic being in a guild of detectives in the same way I would not be sold on Lois belonging there either. Vic does some detecting, but that is not his identity. He is a reporter who happens to do some detecting as the job requires him to do. And really, we're just talking profession here. Really what Vic is, is a philosopher and a student of the human condition. Hence, reporter is a better fit for him as a profession than detective. A detective is too much of a left brain archetype (in my view) for Vic who is more of a right brain character in my view. Detective profession fits better in the science category where as Vic is more a humanities guy.
I raised no objections about any other members of the guild because I'm specifically a fan of Vic (as mentioned) and am particularly interested in how he is portrayed in comics.