So correct me if I am wrong, but consider the following:

3 players are left in a game

each has 100% of the funds required to buy out another player

each has some shares in each other.

If one player (a) buys out another (b), then the 3rd player (c) will receive cash sufficient from the buyout to buy out player a and win the game. In this scenario first one to blink loses!  THink the late game and buyout mechanism still needs some work. 

I also think the 'base' structures shouldnt cost a mining plot, everyone should have access to engineering and hacking arrays with right upgrades perhaps..for 'its more fun' reasons.