There is no one answer to this question as the frequency of dealer busts will vary depending on the particular casino, game, and table. However, as a general rule, it is safe to say that dealer busts will happen from time to time in blackjack.
One reason why dealer busts are not always predictable is that the odds of winning at blackjack are not 100 percent. In fact, the average player loses about 1 in 4 games played.
As a result, even a skilled blackjack player may find himself losing money on occasion. This means that even if the dealer is cheating, a player may still be able to win if he or she hits a lucky streak.
In short, it is important for players to recognize when dealer busts might be possible and to plan their strategy accordingly.
