There will always be people frustrated with top tier items in video games that they can't easily have. Some people just want things to be easier.
I disagree with making redesign changes for the bottom percent of players that want games to be made easier. Have I been frustrated with games that I can't get or maintain top tier stuff? Yes! That's why people play challenging games. In the case of fleet carriers the upkeep cost is part of the cost/challenge/hurdle of having one. Just like any other top tier accomplishment in any other game. "Oh but you need to keep revisiting the accomplishment to maintain the reward" some might claim. So what? That is part of the baked-in challenge/requirement that the bottom percent of players might not be able to handle.
I think you have the wrong end of the stick here Greasetrap. My proposal would be to add an additional parking fee, independent of whether the maintenance fee is changed, in every respect carrier ownership would the the same as or more expensive than it currently is so I am not proposing something to make this top tier asset more easily obtained.
Schadenfreude is a legitimate motivation for game design - there are plenty of examples in this thread of a desire for others to 'suffer'. My parking fee proposal retains that, on the assumption that that's one of the design requirements of the current maintenance fee. Makes no difference to me whether either fee is added/retained or not/removed.