Not just bought but how much enjoyed

The driver of recommendation engines is not just whether the item was bought, but how much the item was enjoyed. For instance, one can watch Transformers 2, but not enjoy it much. To put it another way, most Americans will say they are against burning the American flag. The question, however, is how far out of their way will they go to stop the flag from burning. They most likely will cross the street to put it out. Will they go to the next town? Will they go across the country? That level is the driver of a recommendation engine.