always; ok, with 1 or 2 exceptions when the race was close and I had to wage war to slow down the competition. Otherwise, by that time the game is finished anyway. You can't buy spaceship parts and you don't need to buy buildings in your new cities, because anyway, those cities aren't the one building the parts, but your core ones. So your cash is totally useless... Not that future techs aren't close to useless too, but meh...