Credit cards are usually the best payment method for everyday spending. They let you earn rewards, offer fraud protection, and streamline all the boring bill-pay stuff.But what happens when you swipe your card for something really big? I'm talking $5,000,$7,000, maybe even more. A home project, a last-minute family trip, replacing an HVAC unit -- the real-life stuff that hits out of nowhere.We all know banks have reporting rules for large cash deposits, and sometimes readers wonder whether a huge credit-ca ...