How about some point based system, that the longer you hold exotica the more points you earn and you can then when you have enough points trade them in for some thing's in the exotica market, the most expensive one could be +5% to production so on top of the already +10% to make a max of +15%. Let's bring in real incentive to want to take exotica more frequently than we currently are.

You would need to make the targets from exotica independent from what their actual ships(cuz some people just cannot be killed online, let alone an entire legion of active players) are OR a new rule that you can only guard exotica for 1-2 hours at a time, every 24 hours.

Otherwise, the planet would never leave the hands of any of the top ten legions.

That's a bit unfair to the legions in which most of the players already have the medal and can no longer invade the planet...

And if you remove that restriction, do you really think any of the lower-ranked legions would really have a chance at getting it?

I think once a legion captures Exotica it should be barred from retaking it for 30 days from the time of losing it

This has been suggested before: add a planet similar to Exotica, but with a few differences. It would be found via a mission like Exotica is. But there would be no medal for it, and there would be no limit to the number of times you can take it.