Why do people waste their time watching their favourite tv shows? Why do people waste time watching films at the cinema? Why do people waste time listening to music? Why do people waste time following sport? Why do people waste time? For all those things, it's because they enjoy it. Life is far too boring if we can't learn to find things we like and have fun. You might not understand the appeal of anime, another person might not understand the appeal of science fiction and so on. We all have differing opinions on everything. Anime is fun to some and uninteresting to others. Deal with it.