Guys I have to step in becouse I am sensing some bad thinking here...

All of this - the Rainbow coins, the Rainbow Shards, etc... all of this is FREE addition.
Look at how the game once was - Nutaku is the prime example of that.

We are getting free additional features that allow us, long term players to get extra stuff.
And yet I see discontent, that it is "too hard to get" and its "not worth it".
I wanna treat you as friends and kindly, so thats why I am putting it this way, otherwise I would use completely different language and way of saying this.

To put it simply:
Dont bitch at free stuff.