Using computer generated images for product shots for marketing and development is becoming more and more common. There are many advantages to this approach:

1. No costly photography session. Hiring professional photographers to come in and photograph your product can be expensive and intrusive. In addition, if you later decide you want to make changes to the lighting or to the product, you have to bring the photographer back in. 

2. Product does not have to physically exist. You may have the final design approved, but no actual physical specimens ready for photography. You can get a head start on creating promotional materials without waiting for them.

3. Previsualize designs so that you can evaluate how your product will look.

4. Create a clean hyper-real representation of your product. Make sure your product looks as good as it possibly can, with no real world distractions of dirt, dust, fingerprints etc.

5. Items can also be animated to demonstrate usage or functionality.

Here are some examples. All trademarks etc are, of course, the property of their respective holders. These are for demonstration purposes only and are not meant to imply any working relationship with the organizations whose products are depicted: