Volleyball shoes have a specific set of characteristics that ensure that they perform at the best possible level on a volleyball court. However, this means that they are not that good off the court. The main thing that makes wearing volleyball shoes off the court a bad idea is the sole of the shoe. If you look at it carefully, you will notice that the sole is made of very, very soft rubber. This is what helps the shoe to achieve good grip on smooth surfaces. If you imagine running sandpaper up and down the sole, you can begin to understand what concrete and other rough surfaces do to your shoes!
Many people use them to quickly go out for a drink or for short trips, but for more than that, they want to put on another pair of shoes. These shoes are very easy to damage, and if you move quickly over concrete, shoe polish, or other rough surfaces, the sole will wear out very quickly. When you pay over a hundred bucks a pair for some of these, you need to make sure they last!
Be especially careful not to play other sports on rough surfaces with them, as it puts a lot of pressure on the soles. Once the soles have worn down, the shoes will have poor shock absorption capacity and will also not grip the court. The main reason behind buying volleyball shoes is for good support, grip, and shock absorption, so you are effectively throwing money out the window if you wear them specifically.