Small empire tactic abuse

This is the tactic: Keep one attacker, Camaar, stay small, one planet, no science, trannies x3 ground. When your attackers coordinate small guy in there too. Attacker attacks, small guy takes. Enemy can not retake effectively. Bonus is that small guy can portal up into core, jump fleet and cause mayhem.
Constructive talk:
-make retake morale cost stick to smaller cost, the same morale cost that original or same fam member, use smaller cost (in time the attack or transition was made), in alliance form, lowest alliance cost
-if planet is taken from you, you can retake in 48 hrs without blowing the planet, maybe even keeping the infra, if conqueror has not demolished it