Mate, I symphatize with your frustration but what do you really expect? Remember, you start out with the odds against you.
This is perfectly normal PP feature behaviour, be it on bonus buy or in the ordinary games. At best, 1 in 10 is good, 1 is semi-decent, and the rest is pure trash. Also, when you suddenly bump the stake by a lot, hit a trash bonus, and then drop down again, there is practically no chance to recover.
I've bought tens of thousands bonuses on PP's Bermuda Riches and when I mix the stakes, it is a sure way to kill my balance unless I get a highly unlikely lucky hit just at the right time, but what I found is that on flat stakes (like 4% of your balance/budget), you can keep going for hours and days, and in the end you will be at around the theoretical RTP.
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