I wholeheartedly agree.  The problem is you need to put something in the area to make fighting for it worthwhile....or it has to be in a strategic location.  The first part is tricky to pull of because you wouldn't want to unbalance the game too much, and the second is hard to get through random chance, but could be integrated into maps.

Perhaps if there was someway to allow for artifacts in those gravity wells, like on a derelict ship or spacestation, etc.  Then they would be worth fighting over, while not unbalancing the game because artifacts are already a part of the game.

If the effect wasnt just at non colonizable grav wells, like put a dead astroid there with a good amount of resorces (the ones you have to capture, not build on) now you would have a good reason to have some epic battles in those areas.