Saddle to bar drop can vary by a huge amount, depending on the size of the rider and the desired riding position. Pro riders can take the saddle to bar drop to an extreme of 6 inches, maybe more, in order to be aerodynamic. I'm old and only 5'-6" tall, but I use a 4 inch saddle to bar drop. Many people raise the bars because it reduces the weight placed on the hands, but the excessive pressure on the hands is often caused by using the knee over pedal method of setting the saddle fore/aft position. Ignoring KOP and moving the saddle further back can fix the problem. It may also improve climbing ability.

Those who buy endurance frames with taller head tubes obviously buy into the idea that they don't want much saddle to bar drop.