Aren't you violating their trademark by using Wordpress? Anyway, I think it would be only worth reg price.
Thanks for your comment. Should I contact Wordpress to verify if I am violating their trademark? Or there are other ways? I also found sites, like wordpressbox.com which has got a huge collection of free wordpress themes and is not own by Wordpress... I guess...
I wouldn't touch it personally due to the TM, however even without it I can't see it having any value undeveloped (and also being quite difficult to develop with that keyword combo