Great mining base trick!
Myself, I don't like random ships and fleets (I tolerate a few random ships, though). This includes the world destroyer.
So what do I do when I find it? I kill it. Under the nose of the constructor repairing it. They don't seem to mind, but move off once the WD is gone...
Btw, lost ships ready to be picked up. In my last game (sigh, must make a new one), I was killing pirates at the end. Lots of pirates. This lead to lots of pirates defecting to me, with bases placed on nice fuel sources. Handy! Hint: Rename them, mine was "Pirate Fuel 1", "Pirate Fuel 2"... It makes it easier to find the new one in the ship list, and you should go there to retire any pirate ships anyways...
So, apart form getting lots of gas mining star bases, I got the odd info drop. About some lost ship to investigate. And I don't know how many ships I fetches (and retired) in the Oltaar system at the edges of my home cluster. Well within scanning range of my long range scanners, never mind the proximity array of the ships sent to pick up the last one.
So I wonder, how do they get there? Are their smuggled into the system whenever my LR scanner crews are heading off for a snack? A bit Mathias Rust-ish?
Or were they in the system all the time? If so, why do they show up on LR scanners after the hint, but not before? I have a habit of scanning my LR scanners for pirate bases once "game is over", and a lost ship is even easier to see than a pirate ship/base. Maybe the pirates are more clever than thought? One of those planets is really a secret pirate ship building facility for fancy ships? (never mind the ships usually being way more fancy than what the pirates are riding themselves). And what happens when the emergency alarm goes off from a nearly dead stations is alerting the pirate network to "Oh ****, he is on to us", and they need an distraction fast. And what is the distraction? Ejecting a new ship into space from their fancy ship building facility hidden into a planet in the Oltaar system.
One could wonder why those pirates are not simply taking over the galaxy. They make the Boskara seem like a bunch of wussies.