Are campaign rewards worth the effort?

Lert: Depends on how much you want a 'free' tier 9.5 tonk. It's a status symbol if nothing else, and can be used as a crew trainer - though their credit earning potential is limited as they don't make more credits than regular 10's.   As for question 2: I personally am not paying a single cent for this campaign. I'm just investing time. I imagine the really big clans are using their CW gold for crew training purposes etc, but I'm sure there are some people who do pay for the gold they burn for campaign purposes. I wouldn't know how many or how much though.