Exploits can't be fixed by making them cost more. If the cost was the only problem, it was not an exploit, merely an oversight.
But this is not an exploit, it's plain game design problem.
There's no more tech levels, if you forgot. And you can join any empire with any creature.
If you forbid people joining empires by some arbitrary criteria, they would just create multiple empires.
See, how easy your arbitrary restrictions can be metagamed?
But this is not an exploit, it's plain game design problem.
There's no more tech levels, if you forgot. And you can join any empire with any creature.
If you forbid people joining empires by some arbitrary criteria, they would just create multiple empires.
See, how easy your arbitrary restrictions can be metagamed?