This has been a problem for Imps for a while now. There's not enough rebel players or even dev bases to attack, and it's significantly amplified on conflict planets. Yavin and Hoth are the worst offenders but even Tat and Tako are pretty bad. I basically can't play the conflicts at the moment and stay away from conflict planets lest I get stuck there, unable to get enough stars to leave.
Mature HQ10. Immature meat-bag.
The wall bug giveth, and the wall bug taketh away