The game contains plenty of tools how to ruin someones sand castle. But it does not care about people, who play it to build their own home… Unbreakable, personal… And I have a feeling, that there is a large number of players, who wants one. I understand, that this game is all about distruction of something, what someone else created (otherwise economy just stops), but pretty much sure, there is a place for huge ISK sink, that will satisfy certain sort of players and will not hurt the rest of the Eve.
Suggestion:
Give player opportunity to build/buy a special, very very expensive (price tag on Keepstar level) personal stargate. That will lead to an empty wormhole with no signatures / anomalies / belts and PI capable planets.
After player will jump through, the gate collapses and player will be traped in the WH. He will have to anchor a special wormhole generator. That generator will stay in system forever. Once activated, it will create WH connection to random system in new Eden, that has same attributes as the systems, where the first personal stargate was activated (high sec, low, null or WH odf the same class.). This connection will stay for 16 hours, unless someone jumps through it back to personal wormhole. The outgoing connection will not be visible for anyone, but person, who will create it. No signature, no d-scan mark.
User can upgrade system (again, for insane amount of ISK) to make planets PI capable, to spawn signatures with asteroid belts, that contain small (to keep market safe) amount of high sec ore, to install medical clone in there, but no NPC pirate vessels or sleeper will get in there.
Example:
Let say some rich person will decide to go for the personal WH project. It flyes with ORCA to some calm system and anchor the gate. Gate is not protected by CONCORD and can produce 300 bil kill mail. After 2 hours gate is operational and ORCA jumps through. See the star and 8+ planets (at least one of each type). Gate collapsed. Player now chooses the place where to anchor static WH generator. Once generator is functioning, player jumps back into public space. Player’s ORCA can be probed down, but the WH entrance can’t. Player has 16 hours to do what he wants before the entrance will collapse. If he will do nothing, his personal wormhole will stay unreachable forever. He can to bring his own alt to the system, so alt will activate the WH generator for him, whenever needed. Player decides to bring 4 alts there. So he fleet them all up, or contract bookmarks and make all 4 alts jump through generated WH before his main jumps there as the last person. As the char, who initiated WH generator, jumps through, WH entrance collapses and WH generator will switch to ‘stand by’ mode.
You spend your ISK for decorating your ‘safe’ home, but if you are not carefull (staying uncloacked at the entrance means someone can probe your entrance down), someone still can come to take it from you. Some decorations can allow you to get better overview of the market in different regions, follow your own in game statistic or do other usefull stuff, that makes your game more comfortable without ruining the market.