I think, long term, that this could also lead to a percentage of jump gate or port use as long-term revenue: you help build/repair/open it, you get a cut on future use. Would require a "pay per use" model for jump gates. For docks, could be a "fee" paid along with use of port - tied to travel and possibly ("gulp") ship docking. Ship docking in the real world isn't free - I know from my boats! This would counter the fast expansion of fleets by making ships a cost beyond their use. This leads to another idea.... Space moorings (for use or rent by players) for long term storage at a reduced price. Another form of trade and/or way to minimize storage costs of ships not being used much.