I didn't see a related question to this in the first seven pages, so...
How much profit should be "burned" so to speak in order to maintain a starship?
To explain, my players have recently "acquired" (to put it gently) a starship from an enemy, and my campaign will give them the opportunity to acquire a lot more, of different makes and conditions, provided that is the route they wish to take and they don't slag too many into space hulks.
Considering even the smallest proper starship is a giant flying space cathedral city, I figure each one should punch a hole in their profit factor simply for having it, due to the monstrous amount of maintenance each one requires to function, but am not sure what would be a fair amount.
I am currently hovering around -2 for Raiders, -3 for Frigates, -4 for Light Cruisers, and -5 for full Cruisers, however, there is also the amount of components in each ship, their condition, and their Ship Point values (which help indicate general value) to take into account, and trying to process all of this in a balanced and fair way is headache inducing (especially considering I have created a plethora of unique ships with wildly different abilities and components).
How would you balance this? For anybody who has already figured a solution for this, what did you do?