That makes sense. I invested 0.01 BTC for testing and put the reinvestment to 50%. I got this payment:

https://blockchain.info/tx/48caceee280be50b96f354666ea6681abe04d0f614d077bfd6505f0794ddfbd9 (50% of 200% minus transaction fee)

Later i got this payment:

https://blockchain.info/tx/d847be1221e32a14b8168bfff909b7cd48365aaae70cd7e00be7b3d092460232 (My reinvestment got doubled - minus transaction fee)

You should also notice that there is just a little time difference between first and second payment. That means the game is still young. If you are curious and want to try it out, i honestly think, this is the right time to do so. Of course you have reasons for distrust, you might want to try a little amount first (just like i did). But later the time until payment will obviously just grow. Your decision of course. I am here just to confirm that this game seems working.