internetheaven - 9:06 am on Feb 7, 2011 (gmt 0)
I think this is gray-hat manipulation at best.
Why? It's only grey if the sites you own were built with no content or purpose except to build links from to your main sites. I get links all the time from sites (topic or not on topic) that I don't own. What's the difference between me interlinking my sites (topic or not on topic) that I own?
If all the sites are of good quality and have their own unique style, content and purpose then linking out is part of that. Whether you own the sites you link to or not is irrelevant.