No it's not. How natural it is to redirect 7 domains? Also, domains redirect both anchor and backlinks. I can't imagine the mess that a redirect of 7 domain leaves. Not to mention it's not like you just take the domain and redirect it. In order for process to work (if it will even work), you have to rank them for your keywords at least somewhere, let them age for a few months and then redirect. If it's low end domains though, then do not bother with redirects at all.