usually what I do when gambling (on shinies) is I bet a lot of small amounts like 1-2, and then, when I have a few consecutive losses and I feel it's just the time, I put in a big amount, like 100-200, and usually I win. Sometimes I lose, and I just double that and gamble again, and if I lose again, I double it and gamble again until I win
on average, gambling will result in a loss