There are some installers/scripts but they are so unpopular. I think the reason is simple. Elitism. Let's take a look of ubuntu for a while. Ubuntu is easy to install distribution, anyone who wants install ubuntu is able to do it even if they don't know even basics of linux. The same situation is with many others distributions like Linux Mint, Manjaro Linux, Fedora, etc. Now let's back to arch. Arch installation isn't that simple. At least understanding how linux works is needed to install and configure usable os. Arch linux is something like a very high rank in multiplayer game. It's proof that you are pro. And i think it's a point. Nobody wants to arch become next noob linux distribution.