Why allow shard chat?

Having belonged to one for over a year I can honestly say that these are about as unfair as can be. I've seen players trying to improve their ranking and payouts get put on a hit list, because they caused some whale to miss 50 crystals on his rewards. Collusion can be stopped. Mix everybody up every. 3 months or so. Let's make it fresh. There are several deserving players in my shard that are blacklisted because they irritated SirWhale. A guild mate is in a shard where the same guy gets #1 every day. That's ridiculous. How about something being done.