Btw though the profit is really very small according to investment amount, hope will it will Increase in upcoming weeks. Keep it updated that will helps others to think before make any investment in gambling site.
That's really the usual return of your investment as you are not the only one investing, it's a big bankroll and a lot of investors investing different amount, you only get a little percent of the pie, as per OP's investment, he only invest 0.049 btc in bustabit, so it would not really generate a lot of return.
For some gamblers, they can't stand with a small profit, hence, they will choose to just gamble as they can increase their money into many folds even in just less than a day, but the risk is really high.
The dividend is reasonable unlike if you invest on more riskier platforms and even if the profit is low for sure OP knows about that yet settled for the result came.
And also OP is happy with the result so its better for him and many people glad that he share is experience,profits and insights about the investing on bustadice.
I truly understand that, what OP is doing now is more like an experiment, and who knows if he likes the way his investment is going, he might add more investment for better return. This is an investment journey being shared here, it should be appreciated well.
How did you say it was high risk here? Compared to investing in all other forms, investing in a casino seems safer, as a casino rarely loses money. 
We are always at risk when investing in anything, no place can guarantee our everlasting profits. But I don't see anything to say that it is high risky 
