Why?
i love mine, even though i don't need it too much right now. i don't have cable, and don't plan on getting it again anytime soon. it's great because right now i can cast HBO GO to my TV (my PS4 doesn't have HBOGO) and casting is great for youtube videos/netflix/any other video app pretty much. watchESPN, also not on PS4, casts as well.
once i get another apartment and have a TV in the living room and my bed room, a chromecast will be in one and my PS4 in the other.
also i love being able to cast my music straight to the TV when i get back from a run and am changing/getting ready to go out