Truthfully, I do not believe that I will be playing this on the live servers , as the unit and goods cost are so high for so little reward.
Today I lost 10 units, used about 100 goods and a few diamonds, to gain 15 fps. 10 units might be nothing to some players, but I have recently moved eras , have only just obtained a traz, and so have not built up military units. The military units and goods I produce are fine for playing Guild Expeditions, but not enough to play GB as well. I can only play for half an hour a day on GB and make very little impact on gaining a sector.
It requires the majority of guild players to play to win sectors, and this will not be the case on the live servers unless you are part of a dedicated top guild.
The reward system needs to be looked at to encourage players to start to play and become addicted. As BG stands I think that the majority of players will lose interest after the initial newness of the feature wears off, and the only players will be in the top guilds.
Having said the above, I do enjoy the actual strategy and battling, so hopefully you will improve individual rewards before this goes live.