Visa's (V 0.12%) share price is trading near its all-time high of around $312 per share as I write this. Is it worth buying at these levels? If you have a value bias, the answer will probably be no. But if you are willing to buy good companies at fair prices, the answer might be a little different. And if you appreciate dividend growth, well, your convictions about buying might be even stronger. Here's what you need to know to decide whether or not to buy Visa today.What does Visa do?In simplistic terms, Vi ...