7 Credit Cards

How many credit cards you have? My colleague Tom has seven credit cards on hand at the same time. All are from different bank. That is awesome! He told me that he wishes to separate his expenses. One for his wife; one for petrol and tolls; one for entertainment; one for chores; one for insurance; one for subscription membership of gym, health care, traveling; one for company expenses usages. In this case, he will know how much he spends when he received his monthly credit cards statement. That seems like well organize and manageable but I am totally faint about that. I more prefer having one card group my expense together in one statement.