I write for a PR4 site that has a very broad range of topics. My bio has a dofollow link to my blog with proper anchor text so I basically get one link back every time I submit an article. My question is that given they all come from the same site? do the other links after the first one still have value? I'm assuming they do but that it's reduced already but I'm not really sure. I'm asking because I want to determine if the best move for me is to try and find other places to write for in order to get a link (guest post) or to continue to write for the same site.