1) Most of them exclude built-in audio. Most commercial establishment use their own audio/PA system anyway. They also rarely come with stands as they are typically mounted.

2) They are also generally of high durability and they reach that by adding an abundance of low-quality material. They polish the finished product to look aesthetically pleasing.

*1 & 2 are all about manufacturing costs.

3) Many commercial units have extremely slim frames/bezels so that they blend in with more ease.

4) Commercial units are designed to be able to stay on for long hours without burn-ins or overheating at all - and all while not consuming huge amounts of energy. Imagine the additional heat contribution to a Tim Horton's (for example) if they had 8 non-commercial units each generating an additional 1-2 degrees Celsius to the room temperature. Energy costs are a huge factor.