Those wealthy people would not only buy their planet but also some other planets from the Alliance. They have to pay the full value this time as the alliance would evaluate the price of the planet. Every planet's value is different as they come in all shapes and sizes as well as different minerals and other unique stuff. These people have enough money to buy and control a dozen or so planets. They'd try to not let anyone on these planets reach phase four of the Star force phase as once someone from these planets reaches that realm they could still buy back their planets at a 90% discount but not from an alliance but from these people. The alliance would make sure this happens otherwise no one would be motivated to work hard if they are not rewarded and treated properly.