I know what you mean. I’ve seen and played similar games myself, and I’ve also reached those bonus rounds. I’d say that around 95% of the time, I ended up getting only the mini jackpot as well.
I think the chances of hitting the bigger jackpots, especially the top one, are probably much lower. That’s likely the main reason why you usually end up with the mini jackpot—it’s simply the one you have the highest chance of getting.
I’ve only managed to hit the biggest jackpot once, and I’ve hit the middle one a few times, but most of the time it’s the smallest one. Sometimes I’ve even managed to get two different colors from each coin, but despite that, when it came down to the final four or three coins, I still ended up getting the smallest prize.
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