I thought somebody said in another thread that there is a hardcoded limit of the limit itself to a max of 5000 per player (total 100k + 100k) to keep the savegame file size down ? If 100k x 20 is ok, then go for mines. The problem is that if 5000 is the max then at 250 systems you only have an average of 20 per system, typically 7-10 per warp point. That does not count what you use up in planetary orbit....