Six battleships is a bit much. TBH has two, 101st have one. Not sure about the others, like SF or SA (don't make me count!!). Most TBH members also have a gunboat, but we have maybe one or two cruisers, because they are pretty useless. Also, our ranking system doesn't consist of traditional ranks, but just brothers, and Elders.
Fighter or bomber combat is always the best for me, but there are times I wish I was in my gunboat. Like for instance when I face two cruisers, which is becoming all to regular nowadays.
The only way to restrict battleships is too make the battleship license equipabble (unlootable) and admin controlled. This is the only way I see it working.