Actually we never know how they strategy work on each player because I believe they sure have their own strategy to get profit or even to get this huge wager amount. And I believe for some big whale which make 14 btc wager sure is aiming for profit. But for the rest including me, may be we can count as small whale which is tend to lose this 1% from the wagering amount because from the start we are aiming for big wager amount
If small gamblers like me want to wager 14 BTC have to wager small amounts several times to reach this amount. In this case you will likely lose 0.14 BTC. But whales and rich gamblers can wager 14 BTC with wagring 1 BTC 14 times. In this case, every thing is possible. Maybe double your balance and maybe lose all 14 bitcoins.
Like I said before it does not guarantee that you will lose only 1% but at least it will be 1% for sure. But for big whale if they bet 1 btc, they can even lose more as well, it is double edge sword for them as well. I know it is possible but still it will bear really huge risk just to play with 1 btc amount. Anyway I already said too about the strategy that they used will be difference to get huge wagered and profit. So it just depends on luck whether what your aim is