Take all of the accessories made for every android phone in past 2 years. Now combine them.
You have about a third of the accessories compared to what an iPhone has.
This will always be a huge advantage for Apple, and frankly, I'm jealous of it (just a little bit).
I want to be able to walk in somewhere, see something that looks pretty kickass, and buy it. Instead, I have to dig through piles of crap at Five Below to find something that kinda fits my phone, but the camera hole is in the wrong place. Then I go online and get to wait 2 weeks for an Otterbox to ship.
/rant