I can tell you from personal experience that you will be charged for the ones that require a credit card guarantee (Akershus, CRT, and HDDR). Sept '08 I was ill one morning, so sent my mom and husband on to Akershus without me. My husband told them I was ill, and all they said was 'no problem'. After we got home, I noticed the 'dining' charge on my credit card and called WDW to check on it. The CM was able to say that we showed up one person short at Akershus. I had thought that because my mom and husband were showing up, that we wouldn't be charged the no show fee. However, we were charged for me not showing up. Also this last trip (Sept 26th-Oct 4th) I ate at California Grill. As I was checking in the couple in front of me was telling the CM that two of their party would not be able to make it. I heard the CM tell them that they would seat them, but that they would be charged for the other couple that didn't show up with them. The man tried to argue about it and a manager was called, but the no show' policy was explained to them that if any of the party did not show up, the no show policy was applied for those that didn't show.
Five no charge fees at three different restaurants will get expensive for you guys and that's if they even seat you. There is a big difference going from a table for ten to a table for five.