I have all the ships I want to own and 9 years of maintenance funds on my Fleet Carrier and the credits just keep piling up. There are commanders that are far richer than I am too. I think there should be optional money sinks to waste credits on. Here's a few ideas I have come up with.
- Mini community goal. Put in a huge sum of credits so commanders can haul commodities or kill pirates towards some goal. If it's fully successful, you get something like 5% profit. If only partial success, you get some fraction of your investment back. This could be used to influence the BGS, which is some endgame players care about.
- Powerplay investment. As above, but you invest credits to make fortifications and expansions cheaper and get some profit if they succeed.
- Station building. This should probably be stupidly expensive, but possible to share expenses with multiple CMDRs. The first contributor would have to put in 20 % of the total cost and the others would then have a period of time to participate. Perhaps a month. There might also be an element of having to haul commodities to the megaship that appears on the site. That would make building remote stations more challenging. The station wouldn't necessarily even generate any profit to the people who paid for it, just behave like any other station in the game. People would still build them. I think the significant founders should have their names forever listed in the station bulleting board. Of course the initial contributor would get to choose the name, location and the initial faction(s) if in an empty systems. That alone would interest people, I bet.
- Paying to have commodities delivered to your carrier. Not a credit sink in a same order of magnitude as above, but would still be expensive. The base price would be 5 times of the galactic average multiplied by the factor based on distance to the nearest source of the commodity (which can't be another carrier). Also the delivery would take some time, and one being active would be indicated by increased NPC traffic around your carrier. Much cheaper to get other commanders to bring you commodities, but other players a fickle.