I actually do own all of Genshiken (and KujiUn!), very highly recommended! If no one buys them, you should donate them to a library or something, they really do have that much literary value in my eyes.
What's the shipping cost like for 6-7 volumes of manga, and which of us would pay for it? And is the 'really bad shape' #6 copy of Yakitate Japan included, or can you not bring yourself to give it away in that condition?