Our focus is on quality rather than quantity, by squeezing 4 hours of footage onto a single DVD, image quality has to be sacrificed. Tech talk: The data file has to be highly compressed and the data rate has to be reduced, as a result, the image quality is compromised. The optimum trade off between quality and price is at the two hour mark, where image degradation is minimal. Think of it as one of those emailed video clips that has done the rounds, do you want your videos to look like that? Especially If you are going to be viewing the material on a HD display.
Old saying: “Long after the happiness of a good price comes the bitterness of poor quality!”