HDR Photography

1.  You would need to change your camera settings between each shot, which increases the chance of moving the camera. Also the amount of time it takes to shoot the photo which the subject can move or change positions in the meanwhile.

2. You will need a tripod or other type of stabilizer because you will have trouble aligning your photos if you don't.

3. Someone might take a HDR photo to make money from it or to just save the moments of what's happening in real life through the camera lens. Which means that you can cherish and also look back on the memory you saw/made at that moment.

4. If you merge the photos, it will add more depth to the original/first photo. We will be able to see more meaning and more depth in the photos and the photo itself would just be great to look at.