Then if you lower your bet near the minimum the bonus symbols magically return. In fact when you bet high on slots the machine’s bonus symbols will mysteriously disappear.

The higher you bet the less chance you have of ever getting a bonus on a machine. Their slot machines (even the ones in the High Limit area) are rigged for low bettors. If you are a high bettor like me stay away. If you like to bet $1 or less on slot machines you will probably have an okay time.