Conservatism or Regressive bias

Tendency to remember high values and high likelihoods/probabilities/frequencies lower than they actually were and low ones higher than they actually were. Based on the evidence, memories are not extreme enough.

Like the bizarreness effect, the regressive bias is a symptom of our not-so-awesome memories. The more extreme an example, statistic, or finding, the more likely it is to stick. Choose your data carefully when attempting to persuade customers.