These changes, in turn, extend the shelf-life or replay value of the game. Mods are alterations that might range from a bit of tweak to a complete overhaul of the game. As a gaming company, you don't want your customers to play your games for a few months only after investing millions of dollars on updates. One of the significant drawbacks of the gaming world is the shelf-life. Companies involved in game creation try to outdo each other and even themselves with new updates.
The gaming world has garnered so much interest in recent decades (two at least) as software engineers and programmers continue to develop new and exciting ways to keep game lovers glued and addicted to them.