Reward MasterCoins
For every 10 MasterCoins sold, an additional reward MasterCoin will also be created, which will be
awarded to the Exodus Address slowly over the following years.
As you have said above，the Reward MasterCoins distribution is Centralized. every 10 MasterCoins sold the Reward MasterCoins will be awarded to the Exodus Address,that means Reward MasterCoins will all be yours. Why not consider Reward the traders in a reasonable percent?
As I understand it the reward goes to the Mastercoin Foundation and can be used for further accelerating MSC development.
Trading is economically rewarding in and of itself, if one is rational and lucky, therefore it should not require a subsidy. Such a subsidy would reward unnecessary trading.