Variance indicates that your model is not reliable. Suppose minor changes in the input data result in significant changes in the output. In that case, the model has not properly extracted the underlying patterns, and its decision making cannot be trusted. While having minor and predictable errors is acceptable, it’s a significant issue when the model performs well for some objects but completely fails for others. One possible approach to addressing this issue is to use a rule-based system in post-production, such as implementing a rule like “do not sell anything with a margin greater than 50%.”