Had trouble finding what I needed in the shop.

I needed blue essence to upgrade my mastery, and I didn't realize i could buy a random champion shard with IP. It made me think that I had to wait for chests and key fragments or buy them in order to upgrade my mastery.

I posted a whole post about being disappointed that Riot wanted my money to upgrade my champion mastery.

I figured I'd edit the post to this rather than delete it in case Riot wanted to know that some people might have trouble finding what they needed.