CC companies look for trends on your cards and will call if it looks out of the norm. Owning my own business I use the cards a lot for buying parts and equipment, traveling and other business expenses. Heck I even put a car on one once until I could get the money transferred and never got a call from the bank. However because I ruined the magnetic strip on my debit card I did charge fast food one day and then bought some snacks later at a gas station and they shut my card down. Those two very small purchases were way out of my norm and it triggered a red flag.
