Cool idea. It would be another good initial ISK sink and force the loot fairy’s hand a bit more for the victors. The pricing would have to not be too burdensome though. I think in the 100M range for caps and 500M range for supers, just so they aren’t hoarded.
It comes down to the questions of do we want guaranteed loot for cap kills and does the game need another ISK sink for capital ships?
The structures now aren’t an ISK sink either, so that’s a bad comparison.
ISK sink implies the ISK is sinking out of the game. In the case of these cores, the ISK is merely stored, as it can be turned into the same amount of ISK again by selling the cores back to NPCs.
While I think it’s nice to think of ways to make it more worthwile to fight over capitals in space, like the cores make it more worthwile to fight over structures in space, I don’t think cores are the right tool to do that.
I’m not a fan of caps but simply slapping a payout on something and ignoring the underlying issues is not the solution to anything.
The fact is null is designed to be too safe and comfy, everyone is fat and happy and there is no reason to rock the boat. There is no possibility of real competition from upcoming or new corps/alliances because the progression gap between high/low/null is so stupidly large that no one even bothers.
Instead of expanding “corp endgame” over the years they have left it stagnate. Many of the problems in EVE really have their root in the stagnation of null.