Hi Shulio,
I have a short answer and a long answer for you. The sort(er) answer: Like in any gambling game, on the long term (talking hours to days of play) you will lose, because there is a house edge that is greater than 0. In the short run it depends on your luck: if you get lucky you will win, if you are unlucky you will use. In respect to your chances of winning
Chart Bet is exactly like any other gambling game. On average your chances of winning compared on Chart Bet are higher than in almost all other games because our house edge is so low for Chart Bet (just 0.2%).
The longer answer: The way the charts move is independent of whether you have bought the stock or not, or whether you have deposited or not. You can check this very easily: When you click on 'verify' in the bottom section of the page you can see the exact code we are using to determine the change of the stock from the server secret or the client secret. Even if you are not a programmer you can see that the code is always the same, not matter if you have bought or not.
The difference between the three charts is only their volatility:
the yellow one is relatively stable, the red one is sort of "medium-stable", and the purple one fluctuates the most. All three charts have a very small tendency to go downwards over time, this is how we make money.
Here is how we compute the change for each chart: from the server secret and the client secret we first compute a positive number the determines the rate of change for a chart. Then, exactly like in a dice game, we compute a second number that determines whether the change will be upwards or downwards.
On every update of a chart, the chance that the chart will rise is 0.2% lower than that it will fall. So you are right, each chart has a very small tendency to go downwards, this is how we make money.
I really need to try to write this up in the clearest way possible and add it to the website. Will try to get this done by tomorrow evening. Thanks for asking and please ask for clarification if this was too incomprehensible

I see, i was actually playing with purple and its goes crazy and it is very volatile, in the end it takes up all of my balance, then this means if I got some balance , it would be risky to play the purple chart bert as it is very vollatile and can takes up all of my balance