1. When will that maximum win come? After how many spins... 1k? 10k? 100k?
I guess everything above x10k spins sounds unrealistic (even with action spins in NoLimit, and fast spins in other slots), who can play that many spins without breaks? And what balance should we have in order to withstand it?
Max win coming? We don't know about this, it's sometimes unpredictable.
Even I myself can't afford 1000x spins because my bankroll never gets there, so your maximum win is actually not really expected because the expectation is too far away.
2. Many slots have a bonus buy feature, and some have a super bonus buy feature. Do these things increase our chance of maximum win? And after how many buys of normal and super bonuses can we expect the maximum payout?
Once felt the buy bonus as much as 5 times, the first result was the capital returned again and tried again the same but after 6x -7x buy bonus all of them became lost.
In this buy bonus do not be too greedy because it can eliminate your bankroll.