If they payout ration is 15x the bet amount, all wins you can post here will be big. The problem is, that in order to get a win like that, one needs to lose a lot first, unless he gets extremely lucky. If you just post the winnings here you will create "false" or at least deceiving impressions about the game. You should also post the invested amount compared to winnings. That would give a better view of how that game works, and how profitable it can be.
I started with 1 BTC. At the beginning I have lost more than I won.. But after some time when I got some feeling for this game I got some good winnings. Now I made the 1 BTC to 2.3 BTC.
But you are right, in gambling it is all about luck. But if you play a game with 50% chance of winning you are more likely to win small amounts but in the long run you loose a lot. With this game you get 15x of your bet so it is clear that its more difficult to win there.
Before chain-bet I played satoshi bones very often and lost lots of money that I was not able to win back. At chain-bet I lost like 0.8 BTC but was able to win 1.5 BTC. So my experience with this site says it is better than a 50/50 game.