It does make sense if you consider that YOLOdice has other costs too, such as rakeback which goes up to 30%. I'm sure they'd rather have investors handle that instead of hoping that players lose to pay rakeback. The alternate system (50% of net profits) also has it's own pros and cons. For example, if a player lost 50 BTC and then won it back, commission would get paid as if that player lost 50 BTC.