User blog comment:Omega natsu2/Chapter 370: Demons Reincarnated, Predictions./@comment-4829046-20140206155005/@comment-4829046-20140206160952

Cause if one action shounen shows hearts, all should follow, or else its harder to argue with people. =P But it might just be me and my mixed reactions at seeing hearts being pulled out. It has always fascinated me for its brutality but also due to how awesome it is to do so. I mean seriously, pulling out the still-beating heart and showing it to the owner is one seriously messed up thing to do in a fight. Also since its roots go back to Mayan/Incan/Aztec custom of ripping out the hearts of war-prisoners.

I thought the same but now I doubt it cause I'm pretty sure some series have remained unchanged for years and there are way more series than SnK that have an insane amount of readers.