I have some poem hubs that do very well. I know I won't earn much with them but it is curiously satisfying to have 30 odd viewers a day for bird poems, for example. I don't know if this is exceptional, or poor, or what. I work hard at my poetry, have done for years, and HubPages allows me the chance to add an image if I need to, and link to other related material.
I have other more technical poetry hubs and these are visited primarily by students I think.
So, if your question is about traffic then some poetry hubs can do well,relatively speaking. Poetry won't earn heaps of cash but it will give the poet quiet satisfaction knowing that their work is being read and hopefully,enjoyed.