It is worth it to me. Some of my duplicates are because for example, I got 3 Mr. Bigglesworths and there was no way I was going to delete any of him. I love Mr. Bigglesworth
so much, I used to kick people from raids for killing him in Naxx.
Some of my duplicates like my Crystal Spider
s I considered as necessary for the Celestial Tournament, as insurance, because you can't heal your pets while in that instance.
Some of my duplicates are there because I got my first rare and leveled it to 25, then realized I needed it in another breed to beat a certain tamer fight, for example, my Emperor Crab
Some are just because these pets are powerhouses and I wanted to try making up teams with multiples of them, such as Crow
, Kun-Lai Runt
, Flayer Youngling
, Infinite Whelpling
When it comes down to it, it is just a matter of personal preference. I will keep mine unless space becomes an issue
I love them all!