Finding eigen values is a fun task to involve in. However, its not only a mathematical game you do for fun. Eigen values have wide range of applications in real life.
Vectors are used in fields like Artificial Intelligence, Network Analysis, Physics, Biology, Chemistry, Astronomy, Mechanical Engineering and even Finance & Economics
Any field which involves vector, involves linear transformation and hence eigen values.
Eigen values are not just a paper work, they solve a great problem in real world. And understanding it helps you to gain deeper insights into how things work in real life.