User blog comment:Tribaldragon1/On the matter of Flying Ships/@comment-11254679-20140611060407/@comment-11135771-20140611234359

I already wrote off maintenance costs as being over complicated and unnecessary. The only reason I would even consider bringing it back would be if someone basically just saved up ships and didn't participate in any wars or anything that could harm them in order to make a fleet that was completely unstoppable. Then maybe maintenance would be necessary (although the better option would just be to ask the person to stop doing that). And yes, raising destroyed ships should cost money (maybe the half the amount to rebuild them from scratch).

Implementing such a system all at once would be effectively impossible and probably a total mess.