It's perfectly fine (in theory) to write a blog on Ubuntu and call it UbuntuBlog.org Just because the TM is in the name doesn't mean that you can't use it.
Problem is that this is an appraisal and hope to sell thread. A keen Ubuntu user may pay up to about $60 for it Outside of that market? Worthless.
Linux-Windows.com I don't see having any value either way.