Sounds alot like the "Alliance Transfer Market" that was going to happen in the next-gen of PA.
Personally i like the idea but to have it open to galaxies would take alot of thinking, it may be open to abuse ie - at the end of the round the top10 planets group together in one galaxy to make them practically uncatchable.
I take it that a players cost will have something to do with how he's performing in the game ie:
vaule + xp = cost(?)
I'd like to see a system like this in alliance before it's stretched out to galaxies, lets not run before we can walk
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