I see cookbooks of this ilk all the time on eBay. There's even one for Evening Shade, a show I loved.
I imagine many of them feature recipes supposedly submitted by the actors or have recipes considered relevant to the theme of the particular show? If so, I would think their value would be appreciated mostly by nostalgic fans.
That could be true. I don't think anything was ever prepared or consumed on Star Trek or Star Wars but I can remember candy wrapped in Star Wars paper. There was some sort of popping candy for Star Trek, small like nerds.
In every episode the Lone Ranger made camp and coffee. You would have thought StarBucks would have named one of their coffees after him!