These sites are built by hand and many times, initially the most economic choice for a client who needs I smaller site on a tight budget. If you are looking for a web presence that you will not need to frequently update, than this is the way to go.
Pros: Static Websites can often allow more creative layout concepts. They are built much fast than Dynamic Websites and in most cases they are much cheaper too.
Cons: These websites can sometimes be costly to update. Future redesigns are often more expensive than the alternative.