i don't know if this is a bug, but the planets are almost worthless. i tried to trade 2 class 15 planets for a mining starbase (with only a couple upgrades), and the enemy wouldn't do it. on every game, i can only trade a planet for a few ships or something worthless. if i want to trade a planet, it should be worth a lot. they will only pay maybe 10000 bc for my planet, but the same class of planet costs me 50000+ bc. even though it would only take a few months to make back all of their money in taxes. the trade value of planets and star bases really needs to be tweaked. i get far more for my ships than i do for my planets or bases.

i also built an influence base near an allied planet (completely upgraded) and they won't even give me 1 influence point or 1 bc for it, even though that planet is about to revolt due to being on the edge of enemy territory.

and even if i GIVE them a planet or a fully upgraded star base, they don't even remember it in a few turns. they won't let go of a ship or anything. the bigger the gift, the longer they should remember.