Because inventions are (ideally) new things that can help move society forward, make individual life easier, are "cool" and entertaining, or all of the above. Without inventions, we wouldn't have all the advancements we do today and we would be living like the rest of the animal kingdom by relying on our instincts and hopefully not die soon. See now with inventions, we can rely on tools and make life more interesting and hopefully not die soon.
