Why biting though? Here's the thing, we look upon different acts of aggression and violence in different ways. An elbow is far more dangerous than a bite but a bit is so unusual and savage we take it far more seriously. It's so unheard of in football that we treat it like the greatest sin... of course biting can transmit diseases and is associated with animals too.
Anyway it's my opinion that Suarez isnt some horrible human being, he just has some serious aggression issues like other players, Keane, Pepe etc, unfortunately he bites instead of kicking/punching.
Now from a transfer point of view... looking at it footballing wise any team would want him, but are we going a bit over kill having Messi, Neymar, Suarez. The thing is Messi and Neymar are very direct players who like to see a lot of the ball, and well Saurez is the same. Would he accept less of the ball to appease them? The good thing about Sanchez and Pedro is they are happy to see less of the ball and play a support role.