Yes, I've heard the rewards are worth the effort. I just ... can't do that sort of repetitive grinding, y'know?
I bought a Lucky in the MP at level 3, just so I could have an animated Lucky sitting next to my avvie, but then thought that was rather silly and I sold it back.
I know you can get one when you reach level 10. But ... the grinding. emotion_facepalm
It's a great idea and it's nice to have a Pet System. Like you though, I hope they add more to the experience.