Key Rarity Complaints
I personally think that you should be guaranteed a key in the most expensive rainbow star chest, to make it fair to everyone. I didn't get a key, and I was very disappointed. I'm sure everyone else who didn't get a key was, too. And I want everyone to get a key, no matter what, so everyone can be happy.
Obviously, it would be too easy if you were guaranteed a key for only 50 rainbow stars. And I say that because of the new update where you get 5 rainbow stars for a win and 3 for a loss. If it was the old way, I would think it would be okay for a key costing 50 of the stars.
My idea to solve the problem is to make a new chest that costs 75 of the rainbow stars, and that's the chest where you get the key. The 50 star chest can have the possibility of a key taken away completely, but instead you could get a random legendary customization or a GW1 gesture. It would be nice if we could get a legendary character piece out of the chest (including party characters), but that probably won't happen.