Do you need a microscope camera with higher resolution?

Microscope camera borrow much of the technology from consumer camera and videocam.  The resolution of today's microscope camera is much higher than a few years ago.  Much of these were due to the advances in the camera sensor.  As the number of pixels continue to increase while the computer screen is stay very much at the HD (1920 x 1080) resolution which is just about 2 MP.  Why do you want to have the cameras with higher resolution?  I can think of two reasons: First, you need to crop the picture to show more details on the full screen. Second, you want to print a the picture on a poster.  With higher resolution, you can prevent pixelation.

Above is picture of the cross-section of a leave taken by 3 MP Tucsen microscope camera while on the bottom was taken by 9 MP camera.  You can see pretty much the same resolution for both camera.  (Please noticed that the 9MP microscope camera uses smaller sensor (1/3 in vs 1/2 in for 3MP) which resulted in smaller field of view).

The vein of the leave was cropped from the original picture.  As you can see, the picture cropped from the 3MP image has more pixelation compared to the picture cropped from the 9PM image.