If you put 0.1mBTC as a fee the transaction will usually be in the next block.
We both know that 0.1 mBTC and 0.5 mBTC is the same speed (usually be in the next block). You wrote 0.5 mBTC per transaction only because you want take 0.4 to your pocket and now you tell people that there is 0% fee on sports.
conclusion: there is no 0% fees in the whole sport & fun section because there is hidden extra charge (0.4 mBTC fee on every cashout) which does not mention anywhere. If you have 10000 cashouts per month you take 4BTC to yourself (transparently). Better to tell people the truth that there are additional charges than pull the wool over their eyes that there is no fees at all.