A couple months ago I started this topic. My annoying problem: I registered 9 domains and put them on 301 redirect to the same url. The first 4 domains are redirecting to a deeplink, I did a little linkbuilding, and they were indexed within a week, scoring top 5 on a wide range of important keywords. The next 5 domains are redirecting to the main url, so no deeplink what so ever, did the exact same linkbuilding, but they are still not indexed in google (or yahoo), when I search for the domain in google the backlinks show up, but the url itself isn't being recognized, and the most important, I'm totally not scoring the for the primary keywords for those domains. What's going on, what did I do wrong? I have never problems with indexing in the search engines, so it's very frustrating. All the 9 domains are parked on my (dutch) server, the url the domains are redirecting too is on another (dutch) server.
If the domains are just redirecting to another website, there is essentially no website at that domain. If it were that easy, companies would all own hundreds or thousands of domains all redirecting to their main site. You're best off focusing on your websites that actually have their own content.
My experience is, that it is that easy. I've done it multiple times. For example: I'm redirecting www.mynewdomain.com to www.mymaindomain.com, I make sure mynewdomain.com is indexed by google by setting up some backlinks on different sites, the site got indexed, when I search for mynewdomain.com in google, mymaindomain.com shows up at no1. But also when I look for "my new domain" as a search phrase, mymaindomain.com will show up on the first page in no time. Or is it that only redirects to deeplinks will be indexed? It's working great for deeplinks. But I have also some domain pointing too main sites (search for degroenehel.nl), that's working well also. I don't get it..?