One year later and I finally did all of the weekly challenges for a year straight consecutively since launch so if you didn't spend any money on the game at all it will net you 3,120 coins enough to buy a Legendary skin and an Epic skin from the Shop.
Was it worth it? Nope!
Just realized that if you've have been doing all of your weekly challenges since launch and didn't spend on any money at all for the game you would get to 1,900 coins enough now to buy a legendary skin from the shop.