Bad Average?

So today we went to Carmax.  We test drove several cars.  Sara's car is probably not gonna last much longer so we need to find a replacement.  We have a less than stellar track record with our automobile purchases from private owners and then it hits me... we bought a car last year and the year before.  In the last 2 years we have purchased 2 cars and now, in the 3rd year, we will be buying another car.  Did I mention I hate buying cars?