[fortran]

I would suggest something that makes XP varies from negative infinity to positive infinity.

Each planet would get some kind of bonus each day like:
- no attack launched -200 xp
- no roid gained on attack -200 xp
- its fleet made an attack recall +200 xp
- average value of the planets targeted by an alliance is less than 60% of alliance average value -200 xp for each member
- incs_value/alliance_value x 200 xp for each member per day
- (original_atk_fleet / crashed_fleet) x -2000 xp
.
.
.

things that would punish bottom feed, gang bang and others