Sometimes I try this pattern myself, always paying attention to each roll before finally buying the bonus... but in the end, I fail more often than I win, especially since I don't really believe that I can predict when the lightning will strike.
What I often do in slot games is try spinning several times after breaking the pattern, then buy spins. The results are still uncertain, but this gives me confidence in slot games, even though winning is still random.
A friend of mine once fell victim to this after watching a video circulating during the slot gambling boom in my neighborhood. At the time, my friend was so enthusiastic about gambling that every video featured a pattern or strategy for winning, including manually observing the spins before purchasing a bonus feature. But, unlike you, I experienced more losses than wins.
I'm sure there's no specific benchmark for winning unless you're simply lucky.