What's the use of BTC0.01-BTC0.1 reward if you won or lost say BTC5, BTC10 or BTC20? In either way, you wouldn't care about that at all (so the reward has no purpose).
Consider it as a consolidation price although most of the casino actually rewarded the most wagered since they risk quite the amount of coins , either they lose or they win, but the fact that they risked the amount is needed to be awarded if Safedice is actually will be making a leaderboard contest